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Metra 70-1787 Receiver Wiring Harness

For select 1994-07 Audi and Porsche vehicles

Item # 120701787

This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical...

Find what Fits your car

This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical...

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Item # 120701787

In stock
$19.99
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About the Metra 70-1787 Receiver Wiring Harness

This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical system.

Installation Note: This harness uses your factory amplifier; your new stereo must have two pairs of preamp outputs to connect this harness.

This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical system.

First, attach the color-coded wires on your Crutchfield-supplied harness to the wires from your new stereo. If you don't know how to use a soldering iron, we recommend that you purchase some wire connectors that you'll use to attach the Crutchfield-supplied harness to your factory harness.

Now, once this harness is connected to your new stereo, you'll be able to plug right into your car's factory radio connector. This harness makes installing your new stereo easier, and allows you to put the factory radio back when you sell your vehicle or return it at the end of the lease. A detailed instruction sheet comes with the harness. Warranty: 60 days.

Please read this important note: This harness may not contain provisions for every wire needed to complete your installation, and it will not accommodate special navigation, video, or factory steering wheel control connections. You will need a special adapter if you want your factory steering wheel audio controls to work with your new stereo.

READ LESS

What's in the box:

  • Receiver wiring harness
  • OEM Amplifier harness
  • 40" Separate red wire
  • Fuse tap
MFR #70-1787C

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Metra 70-1787 Receiver Wiring Harness reviews

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Metra 70-1787 Receiver Wiring Harness

Crutchfield customer from Alviso, CA on 6/23/2019

2001 Porsche Boxster

Verified customer (What's this?)
Verified employee purchase (What's this?)

This harness does not have wires for the rear speakers. I had to buy 2 and move wires from one to the other.

Pros: Easier than hand wiring everything

Cons: No connections for rear speakers Red and Yellow wire are reversed for Porsche wiring, but that's not mentioned in the instructions

Crutchfield response on 6/25/2019
Whenever you encounter a problem with anything you purchase from Crutchfield, please contact our Tech Support team right away. They can help you solve the problem and get the harness connected and working properly. Lifetime tech support comes with every Crutchfield purchase.

0 of 0 found this helpful

Excellence

Crutchfield customer from York, SC on 5/26/2019

2002 Porsche Boxster

Verified customer (What's this?)
Verified employee purchase (What's this?)

The customer service was amazing and everything was very easy to use.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Totally worth it.

Crutchfield customer from Huntingtn Bch, CA on 4/15/2019

1999 Porsche 911 Carrera

Verified customer (What's this?)
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This made the install so easy, thanks!

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

Crutchfield customer from Cold Spring, NY on 4/4/2019

2001 Porsche Boxster

Verified customer (What's this?)
Verified employee purchase (What's this?)

Was not a perfect match for my original equipment. I modified the harness to match car harness. Minor delay.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Harness for vehicle with nose amps

Donovan from Albuquerque, NM on 2/6/2019

2001 Audi TT

Verified customer (What's this?)
Verified employee purchase (What's this?)

Easy connections extremely straight forward.

Pros: Wire up the necessary wires cap the rest and plug deck to harness merge the harness to factory harness and your off.

Cons: As long as your not color blind and get the colors matched up, there are no cons

Crutchfield response on

0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

Ced from Lubbock, TX on 1/30/2019

2001 Porsche 911 Carrera

Verified customer (What's this?)
Verified employee purchase (What's this?)

Nice perfect harness, correct for my vehicle. Thanks Crutchfield

Pros: Nice price

Cons: Non

Crutchfield response on

1 of 1 found this helpful

Oh, SO the right harness.

Crutchfield customer from Wildwood, IL on 1/14/2019

2000 Audi S4

Verified customer (What's this?)
Verified employee purchase (What's this?)

I put a Kenwood head unit into an Audi S4 with Bose. Took all of 15 minutes, including the test drive. This harness was a perfect fit, correctly wired, and interfaced the vehicle without modification.

Pros: Perfectly mates radio to the car. Cost effective. Works as described.

Cons: Takes up space in an already crowded mounting pocket. Needs padding to prevent rattles.

Crutchfield response on

0 of 0 found this helpful

Wiring Harness problem

Kenneth from Hot Springs, AR on 8/20/2018

2002 Porsche Boxster

Verified customer (What's this?)
Verified employee purchase (What's this?)

The harness I received did not work per the instructions. The problem was resolved after several calls to Crutchfield Tech Service.

Pros: When harness was set up per instructions, the radio turned on and operated, but no sound came out of the speakers. The Tech Service person was very helpful in resolving the problem.

Cons: The wiring harness had to be installed differently from what was in the instructions in order to get sound from the speakers. Perhaps this was because my car had the optional radio and Bose speakers.

Crutchfield response on

0 of 0 found this helpful

Wiring harness

Crutchfield customer from Skokie, IL on 8/16/2018

2002 Porsche Boxster

Verified customer (What's this?)
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worked like a dream. Direct fit!

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

Crutchfield customer from Sammamish, WA on 7/26/2018

2002 Porsche Boxster

Verified customer (What's this?)
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Product needed to install radio into my Porsche, couldn't have been done without it.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Like original

Joaquin from Miami, FL on 6/13/2018

2000 Porsche 911 Carrera

Verified customer (What's this?)
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Good product fit perfect

Pros: Used original cables of the car

Cons: N/a

Crutchfield response on

0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

Crutchfield customer from Gastonia, NC on 2/4/2018

2000 Porsche 911 Carrera

Verified customer (What's this?)
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Exact match!

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

Crutchfield customer from Tucson, AZ on 1/1/2018

2000 Porsche 911 Carrera

Verified customer (What's this?)
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Good fit.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

Kenneth from Vaughn, WA on 11/30/2017

2003 Audi A4

Verified customer (What's this?)
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Everything plugged right in and played perfectly the first time. I have not used this type of adapter harness before, but I will again! Definitely worth it!

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

70-1787 The Correct Harness for 996s with Bose or Hifi

PATRICK from GA on 9/28/2017

2002 Porsche 911 Carrera

Verified customer (What's this?)
Verified employee purchase (What's this?)

This is the correct harness for any Porsche 996 with Bose or HiFi system up until 2002 (factory door speakers). Crutchfield has it wrong on their website, if you select a 2002 911 lets say, without Navigation but WITH Bose, the crutchfield website says you need 70-1784. WHICH IS WRONG. You need 1787 since you have a small yellow plug that connects to the factory installed amp; which this harness connects to using the red RCA harness in the picture above. So for reference, if you have a porsche 2002 and older, with hifi or bose system, please purchase and use 70-1787 and not 1784; as you need the red plug to tie into the small yellow plug in the factory harness. Crutchfield team needs to update. Any 996 2002 and prior (after 2002 it uses commlink and this can't be used) with Bose or Hifi radio with a factory amp has to use 1787.

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Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

Crutchfield customer from MN on 6/13/2017

2002 Porsche Boxster

Verified customer (What's this?)
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Wrong harness for my car. A lot of wasted time installing and then waiting for the correct harness. Does not fit 2002 boxster.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Easy as pie

Adam from Webster, NY on 3/2/2017

1996 Audi A4

Verified customer (What's this?)
Verified employee purchase (What's this?)

This made installing my jvc headunit in my 96 A4 Quattro a breeze. I see there are some extra steps for the later model Audis but this was EASY.

Pros: Pre stripped wires, long enough, not too long.

Cons: None.

Crutchfield response on

0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

Mariah from Little Rock, AR on 2/14/2017

2007 Audi A3

Verified customer (What's this?)
Verified employee purchase (What's this?)

Great quality product, the only problem we had was lack of correct instructions on how to properly wire my stereo. If you have a 2007 Audi A3 with a concert series stereo, you have to use a combination of the RCA plugs and the speaker wires. We found out that only the rear speakers are controlled by the factory amp and the front speakers have to be wired using the speaker wires provided on the harness that has the RCA plugs. If you do not wire them this way you will not get any sound out of the front speakers. I was a little disappointed by the customer service. I called when I could not get any sound out of the front speakers. I apparently called 10 minutes before tech support closed and was told that I would be called back when my turn came up. But instead, at seven on the dot central time, I received a call back, but when I answered the call was disconnected and when I called back I was told they were closed.

Pros: The wiring harness worked and was well made.

Cons: Lack of knowledgeable tech support.

Crutchfield response on 3/6/2017
We were sorry to hear about Mariah's experience and the mix-up with our Tech Support team. We're forwarding this on to our Tech Support supervisors, so they can look into it. We strive to provide the best service, before, during, and after your purchase, and it looks like we missed the mark this time. We hope Mariah gives us another chance to prove we're the best in the business.

0 of 1 found this helpful

Metra 70-1787 Receiver Wiring Harness

Crutchfield customer from Buffalo, MN on 1/12/2017

2002 Audi A4

Verified customer (What's this?)
Verified employee purchase (What's this?)

The wiring harness is not plug and play there is a fair amount of splicing involved. Don't forget to power the antenna or like me you will have to pull the receiver back out which is no picnic.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

Crutchfield customer from Louisville, KY on 12/24/2016

2001 Audi A4

Verified customer (What's this?)
Verified employee purchase (What's this?)

this harness saved the day !!

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Nice Harness

Riff from Chicago, IL on 7/28/2016

1999 Porsche 911 Carrera

Verified customer (What's this?)
Verified employee purchase (What's this?)

Nicely put together harness. Made installation of head unit a snap. Was able to splice the HU harness to the adapter with no issues in the comfort of the house, rather than contorted in the car. After that it was plug and play. Thumbs up!!!

Pros: Ease of use

Cons: None come to mind

Crutchfield response on

1 of 1 found this helpful

Saved me $$$

James T from Sun Prairie, WI on 6/6/2016

1998 Porsche Boxster

Verified customer (What's this?)
Verified employee purchase (What's this?)

Geek Squad said they may need an adapter when I pulled in for install, it was all included in this. Saved me $50, plus their adapter costs. Thanks for including this stuff Crutchfield!

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

Fantastic

Brady from Ogden, UT on 2/29/2016

2001 Audi A4

Verified customer (What's this?)
Verified employee purchase (What's this?)

I was nervous that the adapter wouldn't fit my car, but it worked perfectly. I wired the stereo to the harness in my warm house on my couch then went outside and plugged it in!

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Metra 70-1787 Receiver Wiring Harness for 2002 Boxster S

Ernie L from torrance, CA on 2/5/2016

2002 Porsche Boxster

Verified customer (What's this?)
Verified employee purchase (What's this?)

Absolutely necessary for the head unit, Clarion CZ305, connects to the Boxster's existing wiring. The wiring harness instructions could be more explicit.

Pros: Fit perfectly for the Boxster S.

Cons: Better instructions

Crutchfield response on

0 of 0 found this helpful

It Works

Scottnweeze from California on 1/13/2016

2004 Audi S4

Verified customer (What's this?)
Verified employee purchase (What's this?)

I've set up a few units now thanks to Crutchfield and when I pull the Metra units out of the packaging, my first thought is "this feels a bit cheesy" regarding the wires and connections, but each one has worked like a charm.

Pros: It works!

Cons: Feels a bit flimsy.

Crutchfield response on

0 of 0 found this helpful

Nice solution, easy to use

SGL from California on 11/26/2015

1999 Porsche 911 Carrera

Verified customer (What's this?)
Verified employee purchase (What's this?)

While not actually plig and play the adapter fits the Porsche 911 Cab plug firmly. The plug is large but there is plenty of room for it. The low level RCA harness to the stock amp worked very well and was a hure help

Pros: Firm stron connection, low level RCA jacks.

Cons: Plug are large ( I assume to accommodate different models ) but fit well and simplify installation

Crutchfield response on

0 of 0 found this helpful

Works 100% in my 2001 Allroad

BigChiefS4 from Minnesota on 9/23/2015

2001 Audi Allroad Quattro

Verified customer (What's this?)
Verified employee purchase (What's this?)

This kit works 100% perfect in my 2001 Allroad when installing a 6 year old Premier car stereo. If you're using the RCA jacks for speaker connections (which you will if you have the Bose system), you will need TWO PAC-SN1's to get rid of popping noises when starting and turning off the car.

Pros:

Cons:

Crutchfield response on

3 of 3 found this helpful

Very easy install

Stefan S from Philadelphia, PA on 5/27/2015

2001 Audi S4

Verified customer (What's this?)
Verified employee purchase (What's this?)

Can't mess this one up, plug and play.

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

Metra

J from Ca on 5/11/2015

2000 Audi A6

Verified customer (What's this?)
Verified employee purchase (What's this?)

Great harness

Pros:

Cons: No rear speaker hooks ups for my Audi from the stock harness

Crutchfield response on

0 of 0 found this helpful

Instructions

Crutchfield customer from North Carolina on 2/24/2015

2000 Porsche Boxster

Verified customer (What's this?)
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The harness works well but the instruction need clarification when it comes to the power antenna connections and possibly the front speaker connections when it comes to using an amp.

Pros: Good hardware

Cons: weak instructions

Crutchfield response on

0 of 0 found this helpful

Harness

David from Bristol Va on 2/23/2015

Verified customer (What's this?)
Verified employee purchase (What's this?)

Allowed the use of my factory Bose speakers with easy wiring.

Pros: Simple and effective

Cons: somewhat bulky for a tight dash installation

Crutchfield response on

1 of 1 found this helpful

Metra 70 -1787: Harnessing Sound

TomL from Blacksburg, VA on 1/28/2015

2006 Audi A3

Verified customer (What's this?)
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The product, upon receiving it, looks like a cross between an IED and Legos. However, it perfectly fits the stereo for my audi a3 at the perfect price (some goon at an audio supplier told me rivaling harnesses could run as much as $200! Preposterous). This product helped me replace the piece of German garbage that is the Audi Concert radio. The harness let me almost plug-and-play in terms of the stereo, and finally I can have use of an aux cord. Now I can roll down the block blasting Tibetian throat singing tunes or my cousin's grindcore band! Thanks! In any sense, I would recommend this product to other 2006 Audi A3 owners who plan on doing a DIY stereo replacement for a non-premium stereo.

Pros: Easy to use, clear instructions,

Cons: Didn't come with custom instructions as ordered, pre-stripped wires, some labeling for wires was unclear.

Crutchfield response on

0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

Mac from Arizona on 1/15/2015

1999 Porsche 911 Carrera

Verified customer (What's this?)
Verified employee purchase (What's this?)

This was the suggested wiring harness suggested by Crutchfield for the ordered stereo and my vehicle information. It worked great and made installation simple and effective without destroying my vehicle.

Pros: Provided a perfect match for installing the stereo I picked with my vehicle.

Cons:

Crutchfield response on

0 of 0 found this helpful

Porsche wiring adapter

Dean from Virginia on 12/10/2014

1999 Porsche 911 Carrera

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Clear instructions for an easy installation.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

Crutchfield customer from Ledyard, CT on 10/16/2014

Verified customer (What's this?)
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Worked so well

Pros: Everything fit well and the directions were very clear.

Cons: Had to change one wire to fit my car

Crutchfield response on

0 of 0 found this helpful

WORKS GREAT

JC from COLBY KS on 10/2/2014

1998 Audi A4

Verified customer (What's this?)
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FIT PERFECT , EASY TO INSTALL

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Works Like it Should

Dave from Lynchburg, va on 9/29/2014

2000 Porsche 911 Carrera

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Easy to use with the provided directions. Quick and easy connections.

Pros: Fast and easy connections.

Cons: None

Crutchfield response on

0 of 0 found this helpful

wiring harness

Crutchfield customer from Hailey ID on 9/4/2014

Verified customer (What's this?)
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Product simplified my install took minuets to do

Pros: Clean professional look

Cons:

Crutchfield response on

0 of 0 found this helpful

Audi conversion with Alpine Radio

Jerry from Wyckoff NJ on 8/23/2014

Verified customer (What's this?)
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Excellent fit and easy to install, anyone with a little intelligence can do this install...

Pros: All Pros everything is easy and everything fits very well

Cons: None

Crutchfield response on

0 of 0 found this helpful

Great product

D23 from Yankton, SD on 8/14/2014

2002 Audi A4

Verified customer (What's this?)
Verified employee purchase (What's this?)

Great product, shipped promptly, and made the installation of my aftermarket CD/DVD/Navigation reciever into my 02 Audi A4 a breeze!

Pros: Ease of connections , and easy to understand diagrams

Cons: No, had to run power to fuse box. connection on the harness for constant power

Crutchfield response on

1 of 1 found this helpful

Doesn't work

Andrew from California on 7/9/2014

2003 Audi A4

Verified customer (What's this?)
Verified employee purchase (What's this?)

Terrible. Doesn't work, doesn't give you half the audio you need for a functioning system in Audi brand vehicles. The problem is the factory amp needs more voltage than a standard aftermarket radio and this harness would lead you to believe. I bought a smart harness from Enfig and it works great, you'll need it.

Pros: cheap

Cons: everything but the price.

Crutchfield response on

0 of 1 found this helpful

perfect fit

Stephen from Atlanta, Ga on 3/17/2014

Verified customer (What's this?)
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it was a perfect fit, very easy to install

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

A big help

DieHardNYYFan from Charleston, SC on 3/5/2014

2004 Audi A4

Verified customer (What's this?)
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This little beauty was a huge help in simplifying the installation of the radio in my son's 2004 Audi A4. I definitely recommend also purchasing the crimping connectors as that would have made the setup even easier. I originally planned to solder the connections together with the leads from the radio but my iron crapped out on me. I went with plan B - small wire nuts and electrical tape - which worked just fine but made the final assembly a little bulky. This is a catch-all connector for the Audi/VW cars of the era so there are some wires that are not used. I cut them back and taped them to avoid a possible short circuit. Using this connector made it painfully simple to connect the radio to the car's wiring harness.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Free and Simple

some guy from Charleston, SC on 2/4/2014

2002 Audi A4

Verified customer (What's this?)
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Crutchfield is awesome for throwing in the whole installation kit for free with my JVC unit. This wire harness worked perfect and they gave me everything I needed for my 02 Audi A4.

Pros: Simple to install and works.

Cons:

Crutchfield response on

0 of 0 found this helpful

Nice and free

jozaan from ny, ny on 12/9/2013

2001 Audi A4

Verified customer (What's this?)
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Worked with no problems

Pros: It worked

Cons: None

Crutchfield response on

0 of 0 found this helpful

2001 Audi TT receiver wiring harness

Mike from MA on 10/28/2013

2000 Audi TT

Verified customer (What's this?)
Verified employee purchase (What's this?)

I bought this harness and installed it along with an alpine head unit for a friend and their audi TT. This car had a rats nest behind the original Bose system but this harness made the install super easy.

Pros: Affordable price Fast shipping Came with instructions (free)

Cons: N/A

Crutchfield response on

2 of 2 found this helpful

It's Crutchfield or nothing!

DJL from Scranton, PA on 9/6/2013

2002 Audi A4

Verified customer (What's this?)
Verified employee purchase (What's this?)

I have installed countless car stereo's, my Audi A4 that this went in to was the biggest PITA out of every radio I've installed! I had originally made the mistake of buying the first wiring harness from another store, that harness wasn't wired right and was shorting out. So I ordered this one from Crutchfield with 2day shipping and couldn't be happier. They walked me through the steps needed to run a new power wire (Apparently Audi never ran a 12V power line for the stock radio!) They also were able to tell me which specific wires would be used and what ones I didn't need. Make sure whenever installing a new stereo that you install the shielding AFTER you are done with the wires! Or you'll end up with 5 stitches like me.

Pros: Crutchfield's superior knowledge of their products, the ease of install and willingness to walk me through adding a wire to a fuse box.

Cons:

Crutchfield response on

2 of 2 found this helpful

Audi A3 Install

GG from Minneapolis, MN on 8/12/2013

2006 Audi A3

Verified customer (What's this?)
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This worked well on my 2006 Audi A3 with the Concert stereo- I installed a Kenwood head-unit and it worked fine. Note, however that a few wires will not come through- neither the illumination nor switched power come through. I had to go to the fusebox to hard wire switched power- otherwise it would not have powered my deck. Used this with an Axxess ACSW-1 to control my head-unit with the steering wheel control. Everything worked just great- I'm very pleased.

Pros: Works well... except...

Cons: No switched power

Crutchfield response on

0 of 0 found this helpful

Product works great, but installation was difficult

NicoleZ from Houston, TX on 7/9/2013

Verified customer (What's this?)
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The product itself works great, but the instructions for installation in an 2003 Audi A4 need to be updated. I was confused when the position of the wires in the adapter did not match the wire orientation in the existing harness. I called customer support and they talked me through it in no time at all... and explained that several of the connections that the instructions specified were NOT needed. The live customer support is amazing- it would be nice if the instructions were as explicit.

Pros: Works great.

Cons: I found the installation instructions misleading.

Crutchfield response on

0 of 0 found this helpful

Perfect, no hassle conections

Robert from San Luis Obispo, CA on 6/22/2013

2001 Porsche Boxster

Verified customer (What's this?)
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Was so simple to hook up Stereo, almost full proof

Pros: Easy and good direction

Cons: Has to strip all the wires down a bit further than they way they were when it came.

Crutchfield response on

0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

Dan from Yakima Wa on 6/15/2013

Verified customer (What's this?)
Verified employee purchase (What's this?)

Wiring kit fit for my car. Worked with the Bose System. Easy to connect and easy to follow instructions.

Pros: Connected perfectly.

Cons: One of the wires in the harness was loose. I had to figure out where I was getting noise from. I called Crutchfield and they sent me a new one! No problems since.

Crutchfield response on

1 of 1 found this helpful

Workded on my 2002 TT Bose!

Greg from Los Angeles, CA on 4/22/2013

Verified customer (What's this?)
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I finally got this thing to work on my Audi TT quattro with Bose, I was ready to give up, been browsing forums for days, everybody seem to have different problems but finally got it work and what a great sound! The Bose amp is working everything is perfect. You will need to order a pair ground loop isolator though or when you turn off the car you'll get a loud "pop" in the speakers. You will also need to purchase a wire with fuse clip because you wont get the power from the harness and your HU won't turn on. It's all explained in the documentation that comes with the harness.

Pros: Good instructions, easy to use

Cons: Didn't come with the 12V permanent wire.

Crutchfield response on

2 of 3 found this helpful

Worked Perfect

Crutchfield customer from Seattle, WA on 4/2/2013

2002 Audi TT

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This worked perfectly!

Pros: Works

Cons: NA

Crutchfield response on

0 of 0 found this helpful

Doesn't fit Audi A4 2002

MarkH from Basking Ridge, nj on 12/9/2012

2002 Audi A4

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It fits only to the extent that they snap together with Audi's harness but it doesn't give you full function of the car stereo. A work around for the rear speakers is a must. The color matching of the wires to the car is not one for one either. I installed the Alpine cde 136bt . Step by step instructions were not specific to this car enough to account for the wiring issues encountered.

Pros:

Cons:

Crutchfield response on

1 of 3 found this helpful

wrong harness

Audiman from Los Angeles, CA on 11/24/2012

2004 Audi A4

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Wiring harness received dis not allow for rear speakers or subwoofer connection..had to order different harness

Pros:

Cons:

Crutchfield response on

0 of 2 found this helpful

Not all you need with a 06' Audi A3

EddyW from Las Vegas, NV on 11/23/2012

2006 Audi A3

Verified customer (What's this?)
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This might work for certain Volkswagen vehicles, but this harness did not work at all for my Audi A3. You are also going need a CANBUS adapter to go with this harness.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Great and easy to use

AndrewK from York PA on 10/3/2012

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I saw a review for a 2002 audi TT coupe. I also have this vehicle and this harness works perfectly fine. I thought it didnt at work but you have to make sure that you use the right PRE AMP outputs. The coupe with the bose system only takes signals from the front left and right ouputs. The rear RCA were not used.

Pros: Colors matched aftermarket unit. Easy to install,

Cons: none

Crutchfield response on

1 of 1 found this helpful

Over all Great job Crutchfield

Ben from Eugene, OR on 6/16/2012

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This harness worked very well for the installation of a Kenwood KDC-X896 head unit in my Y2K Porsche Boxster. My car has the factory "premium" sound system with amplifier in the front trunk. Only the pre-amp outputs were used as the amp provides all the power to the speakers. The power harness fit tightly. The sound/ pre-amp harness fit but only filled half of the female factory harness, which meant only one side clip locked in (which seemed to be enough). Connecting the the loose wires to the head unit was no problem (I use crimp type connectors and always have w/o problems as long as they stay dry). PAY ATTENTION TO THE NOTES!! as my Bat+ and BAT Switched were reversed as Crutchfield indicated in the note. Install went smoothly, and the unit is working great. Thank you Crutchfield!

Pros: Worked very well, and fit my car

Cons: Pre-amp harness only filled half my factory harness so only one side clip locked in (it is working though).

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1 of 1 found this helpful

Pay Attention Porsche Owners

QpQ from Northern Virgnia on 4/15/2012

2002 Porsche Boxster

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Like a few other folks have mentioned, the Yellow and Red power wires are switched for late 90s and early 2000s Porsches (986s and 987s). Very annoying. However, there was actually a note in the bottom of the wiring guide that was included that mentioned this. However, I of course didn't notice it until everything was soldered and installed. Took it out and re-did it when I realized the mistake. Annoying but functioning now. The main problem I had with this again seems to be a problem for many people. Why are the rear speaker wires missing?? Crazy. I ripped some wires out of an old harness I was throwing out and inserted them into the right places on this unit and it worked just fine. In the end, everything is working fine. However, it should have been much easier than this. This thing is overpriced at $25 for the problems it has.

Pros: Swapped Yellow/Red wires is actually noted in the included instructions

Cons: missing rear speaker wires Yellow and Red wires are switched for late 90s-early 2000 Porsches.

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3 of 3 found this helpful

Have to modify for 2001 Audi A6

Kevin from Omaha, NE on 4/8/2012

2001 Audi A6

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My car has a factory amp for the rear speakers and have found out that if you use the RCA cables in this kit the new stereo will make a popping noise when switching between certain opitons like FM, CD, etc. Cut off the rear RCA and plug into new stereo's rear speaker hookups to eliminate this.

Pros: Made well with 1 exception listed in cons.

Cons: My car has a factory amp for the rear speakers and have found out that if you use the RCA cables in this kit the new stereo will make a popping noise when switching between certain opitons like FM, CD, etc. Cut off the rear RCA and plug into new stereo's rear speaker hookups to eliminate this.

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1 of 1 found this helpful

Great harness if you know how to hook the power wire

Guyle from michigan on 4/3/2012

2003 Audi A4

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Great harness. One thing to note is in my 2003 Audi a4 the red wire did not serve a purpose in a harness. You must run the red wire from your head unit to the fuse box or some other power source. I used fuse 37(windshield wiper fuse)

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0 of 0 found this helpful

Good

Adamk from Nepa on 3/31/2012

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Good easy to use harness

Pros:

Cons:

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0 of 0 found this helpful

Good, but 1 wire wrong

Close.... from Lexington, KY on 2/15/2012

2001 Porsche 911 Carrera

Verified customer (What's this?)
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I've used this brand of harnesses several times, and they are always pretty solid. In this case, the switched power and battery power were backwards for my 2001 Porsche 911. I had to use a meter to figure out the right ones.

Pros: Good directions. Easy for a reasonably skilled installer to follow.

Cons: Power types swapped.

Crutchfield response on

1 of 1 found this helpful

Metra 70-1787 Receiver Wiring Harness

Crutchfield customer from queen creek,AZ on 1/20/2012

1999 Audi A4

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works great. came with everything I needed.

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0 of 0 found this helpful

Not compatible with Porsche 911 (996). Ugh!!!

Gordie from Bellingham, WA on 12/29/2011

2000 Porsche 911 Carrera

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No connection for speakers, only power etc. Waste of money. Installing a Kenwood stereo . Very unsatisfied with this harness. May be the last time I purchase from Crutchfield. UPDATED 1/3/12: After calling Crutchfield for support I got it to work. Thank you. I would like to change my review from 1 to 5 stars. :0)

Pros:

Cons: No connection for speakers, only power etc. Waste of money. Very unsatisfied. May be the last time I purchase from Crutchfield.

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0 of 0 found this helpful

Not all you'll need

Ben B from Tunkhnnock, PA on 7/26/2011

2002 Audi TT

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This harness will get you started. The 12V switched power in the harness had nothing on the car side to power on the radio. I eventually tapped into a wire on the back of the fuse box for this source. I believe the factory radio works off a CAN bus data signal. Past that, I also needed to purchase a SVEN4(additional $$) to get rid of speaker pop noise caused by the factory Bose amp turning on. Then I had to try and fit all the wiring and the SVEN4(which is roughly the size of a VCR, exaggeration) into the dash so the head unit would fit. The dash kit was then modified so the trim ring for the head unit could be used, making it more secure and cleaner looking. Most troublesome install I've ever had in 10 years. Crutchfield support was little help for this vehicle.

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1 of 1 found this helpful

Not all you need for Audi A4's

T Buckets from Gilbert AZ on 7/8/2011

2002 Audi A4

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According to a local Scottsdale Car Audio store (Who works on all years of Audi's straight from the local dealerships here in AZ) the A4's need a LOC or crossover control to plug into the aftermarket deck's rear speaker wires and then cut off the rear rca's on this adapter and hook those wires into the crossover control. Then it can turn up and control the rears. The one crutchfield sent to me is made by PACaudio. It with this harness works great! The crossover is huge and has to be smushed way back behind my HU.

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1 of 1 found this helpful

Metra 70-1787 Receiver Wiring Harness

thomas from South Jersey on 6/15/2011

1999 Audi A4

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I got this for my 99.5 A4, and it made the install easy, however there's no wiring for the rear deck speakers. The only way to use your rear speakers is to hard wire them to the actual harness, which, in my opinion, defeats the purpose of the adapter. [Editor's Note: Our Technical Department has emailed you with instructions. The rear connections are on a separate included harness.]

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2 of 2 found this helpful

02 Audi A4 No rear speakers

Tbuckets from Gilbert, AZ on 6/13/2011

2002 Audi A4

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This has been the hardest and longest wire install for any car I've done... Most of it because of they way Audi set their stock radios. But this harness is supposed to hook up the rear speakers to my deck and it promises the rear speakers will work. But with everything hooked up correctly, the rears are barely even audible even with the volume cranked way up. The tech on the phone said I will have to cut and splice at the factory plug and at the stock rear amp to bypass the amp... This is a lot of work. It should still power the rear amp and is a bummer that I have to tear my trunk to bits just to get the rears to work.

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2 of 2 found this helpful

Perfect Harness

RussCuss from Scottsdale, AZ on 2/10/2011

2001 Audi A4

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This wire harness was so easy to hook up. All the color's matched my after market cd player. Just had to plug the RCA into the cd player to get the rears to work. Make sure you tape off your extra wires for your rears on your after market cd player. All in all very easy. I will buy from CrutchField forever now.

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0 of 0 found this helpful

Metra 70-1787 Receiver Wiring Harness

jason from greenwood, indiana on 9/26/2010

1997 Audi A4

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97 Audi A4 - hooked up perfect no problems

Pros:

Cons:

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0 of 0 found this helpful

1999 A6 with Bose System

Danny from Columbia, SC on 2/6/2010

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Harness worked great with my 99 A6 with the Bose system. The only issue is that I now get a popping sound from speakers (sometimes quiet, sometimes loud) whenever I change sources or even between stations or CD tracks. I've read that this is due to the way the Bose amplifier is wired up. I do however have FULL functionality of both FADE and BALANCE. All reviews I read said I would forfeit these if I went to an aftermarket unit, but I have no issues. Also, I'm using an Alpine CDA-105. (also purchased from CF). Overall, good product. My only beefs with my setup is due to my car's factory system. Can't fault this harness for that.

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2 of 2 found this helpful

Does not work for an Audi TT coupe

Mark from Delaware on 1/21/2010

2002 Audi TT

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Both the Radio installation kit and this wiring harness do not work with a 2002 Audi TT coupe. I have never had these issues with equipment from Crutchfield. I gave 2 stars since I believe I can move the pins around to enable this harness to function, but I should not have to do this. Now I have to try to find out what the factory pin out is so I can adjust this harness. This should not be listed on Crutchfield as "This item Fits".

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Cons:

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6 of 7 found this helpful

2006 Audi A4 (non-Bose)

Nathan from Missouri on 1/5/2010

2006 Audi A4

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THIS REVIEW IS FOR A 2006 AUDI A4 (non-Bose) For anyone else that may need a harness for an aftermarket stereo Crutchfield is great. Keep in mind that you MUST run the ignition wire (red) to an ignition power source such as the windshield wiper fuse. The factory Audi stereo powers on using a different method. Even though the wiring harness from Crutchfield has a red wire dont use it. If you call Crutchfield's tech number they will tell you to run the wire and splice it into your windshield wiper fuse (fuse 36). This should be a 30 amp fuse. This has been by far the toughest car to put a head unit in but afterwords the results are well worth it.

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1 of 1 found this helpful

1998 Audi A6 with BOSE - Worked with NO PROBLEM

Christopher from Philadelphia, PA on 10/29/2009

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I have owned several Audis over the past 10 years, luckily all the harnesses being the same was helpful. Every Audi I have owned has had the "Premium Sound" package. I've had an 84 4000, 87 5000, 89 200 wagon, and now the 98 A6. I was a little hesitant to put this stuff together myself, especially in such a newer car, but I did it and it worked fine. ALL of the factory speakers in my A6 are working, even the factory sub. There is NO reason to pay the big chain stores the $175 that it would cost to have them "hard wire" anything into your Audi. If you're Audi has the Bose system, make sure that the Blue Wire is matched up and the deck you're putting in has two RCA outputs on it, this way, all of your speakers will work. The only things that I lost after this was blanace and fade. But it sounds fantastic without that. Thank you Scooter for pointing me in the right direction and saving me a ton of money!!!

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1 of 2 found this helpful

Harness wires were not in the correct order

Kevin from Houston, TX on 10/28/2009

2004 Audi TT

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I'm not an expert in radio installations, so I do not know if this is typical, but the placement of the connectors in the wiring harness did not match the location of the connectors in my car (2004 Audi TT Roadster). It took pliers, the schematics from my factory radio, and about 20 minutes of trial and error to reconfigure the placement of the pins in the harness. (Like I said, I am not an expert in radio installations). Aside from that, the harness works as one would expect it to work.

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Cons:

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5 of 5 found this helpful

Boxster problem

R from Hawaii on 3/25/2009

2000 Porsche Boxster

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This harness as-is will probably not work for a Boxster. My 2000 has the factory installation with speakers in the door. The Alpine deck I wanted to put in from another car did not have the RCA line level outputs, and cutting up and attaching wires sent full power from the Alpine amp (rather than line level from a pre-amp) into the factory amp. It was also two channels rather than the four available on the factory amp, so no door speakers, no fader. I think the Kenwood Excelons have the necessary outputs. That's just the red connector! The black connector had connections in places probably not needed as well. I'll probably get an Excelon.

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0 of 0 found this helpful

Problem for Porsche Boxster

englishgrok from Mountain View, CA on 2/2/2009

2001 Porsche Boxster

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After I installed my JVC Arsenal KD-AHD39 using this wiring harness, I found that the radio worked well but lost all the settings when it was powered off, which was a real pain. I concluded this was a problem with the wiring harness and contacted Crutchfiled who confirmed that for the Porsche the power wires had to be reversed. I was disappointed that I only found this out after I had installed the unit and found the problem.

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2 of 2 found this helpful

Good luck with rear speakers

Kevin from Madison, WI on 11/15/2008

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This wire harness comes with good instructions and what seems to be a good quality harness. My only problem is like another posted said, the rear speakers are preamp outputs that go to your deck. I was never able to get my rear speakers working correctly on my 1996 Audi A4 so after a couple hours of troubleshooting I gave up and just ordered after market speakers for the rear and will run wire back to them.

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Cons:

Crutchfield response on

2 of 2 found this helpful

Metra 70-1787 Receiver Wiring Harness

jtpar24 from St Petersburg, FL on 11/2/2008

1999 Porsche Boxster

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Just what you would expect from Crutchiefld, even though I didn't buy stero from them I still got top notch service. Told them what I needed and that's exactly what I got....Receiced my harness in two days and had my stero installed that day....thanks again..

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Crutchfield response on

1 of 1 found this helpful

Good, nor Great

Sneed from Manistee, MI on 3/1/2008

1998 Audi A4

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This wiring harness is just like any other that you would buy. When i got mine a few of the wires had fallen out of the plastic harness it's self, but they were easy to click back into place. One thing that i didn't like was the fact that that there are no speaker wire connections for your rear speakers (there were only rear amp outputs). I cannot use the fade on my CD player with the connection like that. Other that that, pretty much just a normal wiring harness.

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Crutchfield response on

13 of 16 found this helpful

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Pros:

Cons:

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<< >>

More details on the Metra 70-1787 Receiver Wiring Harness

Stacey B.

Product Research

Features

Wiring Harness: This wiring harness prevents having to cut your vehicle's factory radio plug when replacing your factory radio with an aftermarket head unit. Simply solder or crimp the wiring harness to your aftermarket head unit's harness (solder and crimps not included), plug the aftermarket head unit's plug into the rear chassis of the aftermarket head unit, and plug the wiring harness into your vehicle's factory radio plug.

Note: Installation tools, hardware, and accessories are not included and sold separately. Please see the Accessories tab for recommendations and availability.

Wiring Notes: If the wiring harness is not equipped with a ground wire, you will need to ground the aftermarket head unit's ground wire to the metal chassis of your vehicle. Some vehicles may require bypassing the vehicle's factory amplifier (in another location from factory radio) or hardwiring certain connections. If your vehicle is equipped with factory steering wheel controls, an additional adapter is required and sold separately.

Receiver Recommendation: It is recommended that this wiring harness be used with head units that have front and rear RCA line outputs. If using a receiver with only one pair of line outputs, you will need to add Y-adapters and you will lose front-to-back fader control. If you have questions, please contact a advisor at 1-888-955-6000.

Wire Code Chart:

Harness #1 Power/Front Speakers

Wire Color Function
Red * +12 Volt Accessory
Yellow * +12 Volt Constant
Black Chassis Ground
Blue Power Antenna
Orange Illumination
White Left Front Speaker +
White/Black Left Front Speaker -
Gray Right Front Speaker +
Gray/Black Right Front Speaker -

* The function of the Red and Yellow wires is reversed for 1997-2002 Porsche Boxter and 1999-2001 Porsche 911

Harness #2 Factory Amplifier

Wire Color Function
Blue/White Amplifier Turn-On
White RCA Left Front Amp Input
Gray RCA Right Front Amp Input
Green RCA Left Rear Amp Input
Violet RCA Right Rear Amp Input

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
same reason [ john  Sep 11, 2019 ]
A
Fast shipping and availability for rare parts [ Nick  May 12, 2019 ]
A
help installation [ L. Dennis  Aug 20, 2018 ]
A
Needed to hook headunit to factory wiring [ ben  Mar 14, 2018 ]
A
Chose this item because it was the only option [ John  Dec 28, 2017 ]
A
Required to hook up my new head unit to my factory setup and free as part of purchase. [ Aaron  Dec 20, 2017 ]
A
To connect aftermarket radio to factory wire harness [ George  Nov 27, 2017 ]
A
It was recommended for Larry [ cesar  Oct 03, 2017 ]
A
I will need this [ Scott  Apr 25, 2017 ]
A
Needed to install aftermarket radio in 98 Audi A4 [ TUCKER  Apr 02, 2017 ]
A
included in kit [ Bryan  Feb 05, 2017 ]
A
Came with the kit [ Leonard  Jan 16, 2017 ]
A
makes life much easier [ Scott  Dec 10, 2016 ]
A
needed [ DAVID  Nov 17, 2016 ]
A
Most straight forward option for connecting headunit to factory harness, saves the headaches [ Alfred  Nov 01, 2016 ]
A
Working with a Porsche Boxster is a little tough, Crutchfield did all the research and got me the right harness for an easy connection. [ Milan  Jul 21, 2016 ]
A
Makes installation easier [ MARLON T  Jul 08, 2016 ]
A
Required for my new stereo! [ Mikenley Curran  Jul 06, 2016 ]
A
Easy to use. Crutchfield provided excellent instructions on how to connect and it worked like a charm. [ yunhaw  May 24, 2016 ]
A
required to install [ james  May 03, 2016 ]
A
part of the accessories kit [ Mark  Apr 17, 2016 ]
A
no wire cutting on factory harness [ Bee  Feb 26, 2016 ]
A
made for my vehicle and keeps the use of factory amp. [ jorge  Feb 20, 2016 ]
SHOW MORESHOW LESS

4 questions already asked

Q
How do you hook up the rear speakers if there are only front left and front right speaker connections?
[ Frank  Jan 28, 2019 ]
4 answers
A
The rca pig tails are for the speakers. I cut them off and wire it directly to the factory amp.
[ JESUS  Jan 30, 2019 ]
A
I am assuming this is for an Audi. I had to buy a completely separate piece to go with the wiring harness before the stereo would work at all. Cant remember what it was but you have to get it because the rear speakers are on an amplifier and this piece is the only thing that would make the stereo work.
[ scott  Jan 30, 2019 ]
A
I couldn't honestly answer this...I took it to an installer.
[ Doug  Jan 30, 2019 ]
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer.
[ Krissy  Jan 30, 2019 ]  Staff
Q
Good Evening, I have a 199.5 Audi S6 with a bose stereo. It calls for a 70-1785 but this was incorrect and the plugs the car has are a 70-1787. I have the stereo powered up and the amp appears to be turning on but I get no Audio. I see others have had the same issue and needed to change pins. I was just wondering if you have the correct pin locations for this application? Thank you, Eric
[ Eric  Aug 05, 2018 ]
1 answer
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer.
[ Krissy  Aug 10, 2018 ]  Staff
Q
I have a 1994 Audi cabriolet and tried to use this adapter with this Pioneer head unit. The black plugs work perfect but red plug won't. Adapter has 3 rows of connections but the end in my car only has 2. Result can't get rear speakers to work. Another adapter I can get?
[ Dennis  Apr 26, 2016 ]
1 answer
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the connections on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
[ Kenny  Apr 26, 2016 ]  Staff

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