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Metra 70-1786 Receiver Wiring Harness

Connect a new car stereo in select 1994-2008 Chrysler, Land Rover, Mercedes, and Saab vehicles

Item # 120701786

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 # 120701786

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$16.99
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About the Metra 70-1786 Receiver Wiring Harness

Metra 70-1786 Receiver Wiring Harness

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

Metra 70-1786 Receiver Wiring Harness

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're not using a soldering iron, we recommend that you purchase some wire connectors to secure the connections. Check out our handy article on three ways to connect the wiring harness here.

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.

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What's in the box:

MFR #70-1786

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Metra 70-1786 Receiver Wiring Harness reviews

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Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from Escondido, CA on 8/22/2019

1998 Mercedes-Benz ML320

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

The Metra 70-1786 harness was half the price at Crutchfield than my local installer wanted. The color code on the RCA jack's was not the same as my head unit but only took a couple of minuets to figure it out. Thanks for the easy install. Gene

Pros: made for an easy install

Cons: wish I could have kept the factory CD changer

Crutchfield response on

0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Joe from Coatesville, pa on 7/25/2019

2000 Mercedes-Benz CLK-Class

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

Good product with easy instructions

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from North Port, FL on 6/9/2019

1994 Mercedes-Benz SL-Class

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

As promised "plug and play"

Pros:

Cons: Could have used longer cables for my application - 1995 MB SL320. Not much room behind the dash.

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0 of 0 found this helpful

Happy Customer!!

Crutchfield customer from Dededo, GU on 4/2/2019

2001 Mercedes-Benz SLK-Class

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

Easy to install plug and play. this product is awesome!! Instructions are very easy to follow.

Pros: Easy to install.

Cons: none

Crutchfield response on

0 of 0 found this helpful

Great harness

Bart from Hoffman Est, IL on 3/7/2019

1998 Mercedes-Benz SL-Class

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

Made wiring my new unit into a Mercedes SL500 with Bose a breeze!

Pros: Super easy to mate to unit harness. works flawlessly

Cons: None

Crutchfield response on

0 of 0 found this helpful

Works on 2004 Crossfire Limited

Jeffrey J from Lauderhill, FL on 10/24/2018

2012 Ford Focus

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

Hooked up to stock harness, the only issue I had was the orange wire but all in all after calling tech support I was on my way to installation.

Pros: Easy hookup to stock harness

Cons: wished all the wires were tagged.

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0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Chris from Olympia, WA on 9/17/2018

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

The replacement works well. Thank you for the fast response!!

Pros: The connections were easy and the system sounds great.

Cons: The SWC wiring may not correct as the connection blew the small amp fuse on the SWC.

Crutchfield response on

0 of 0 found this helpful

wiring harness

Crutchfield customer from Eureka Springs, AR on 8/9/2018

2008 Chrysler Crossfire

Verified customer (What's this?)
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Best plug and play with a few wire connections EVER. Thanks

Pros:

Cons:

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0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from Lorain, OH on 5/24/2018

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

No way would I want to install the Kenwood unit I bought without a Metra Harness. For me it made the install simple. I continue to return to Crutchfield because i know they are going to make my live easier. And, their helpline is virtually no waiting and I get the right answer the first time.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from Spanish Fort, AL on 4/29/2018

2005 Chrysler Crossfire

Verified customer (What's this?)
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Worked great it and instructions provided worked well

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Plug N Play

Tom from Hawkinsville, GA on 3/21/2018

1999 Mercedes-Benz SLK-Class

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

This along with "Harness Ready" service ... you have a Plug N Play installation

Pros: time saver

Cons: None

Crutchfield response on

0 of 0 found this helpful

Metra Harness

D from Tuscaloosa, AL on 3/21/2018

2004 Chrysler Crossfire

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

Exactly what I needed. Right part the first time is always good.

Pros:

Cons: None

Crutchfield response on

1 of 1 found this helpful

Waste of money and time

P from Annandale, VA on 2/18/2018

2001 Mercedes-Benz E-Class

Verified customer (What's this?)
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Waste of money

Pros: Not one

Cons: Did not match up fried every fuse. Super fun!

Crutchfield response on 2/28/2018
Once we saw this review, our Tech Support guru, AJ, reached out to P to help him further. We'll either help him get the harness connected properly, or help him return it for an exchange or refund.

1 of 2 found this helpful

Metra 70-1786 Receiver Wiring Harness

Michael from Ft Walton Bch, FL on 1/1/2018

2004 Land Rover Discovery

Verified customer (What's this?)
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Made wiring a snap!

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from North Hollywood, CA on 7/23/2017

2000 Mercedes-Benz E-Class

Verified customer (What's this?)
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Direct fit

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Great product

Robert from La Verkin, UT on 7/23/2017

1997 Mercedes-Benz SL-Class

Verified customer (What's this?)
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Great Product

Pros: Great product, wiring same color as factory

Cons: N/A

Crutchfield response on

0 of 0 found this helpful

Installed in 2003 Land Rover Discovery

Crutchfield customer from Santa Barbara, CA on 7/20/2017

2003 Land Rover Discovery

Verified customer (What's this?)
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Installed in 2003 Land Rover Discovery. Connections are tight. Able to connect factory harnesses into this Metra adapter. Wiring colors were more or less the same as the vehicle and aftermarket Pioneer stereo, which is helpful.

Pros: Simple to use

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from MN on 6/13/2017

Verified customer (What's this?)
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Finally the correct harness for my boxster!

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Loved it

Brian from Honolulu loved it on 6/8/2017

1997 Mercedes-Benz C-Class

Verified customer (What's this?)
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Make your life easier!

Pros: Was nice to know there was a harness available for my car's match the color wires and connect!

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from Memphis, TN on 3/26/2017

1999 Mercedes-Benz SL-Class

Verified customer (What's this?)
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so easy

Pros:

Cons:

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0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Dmitry from Fredericksburg, VA on 3/18/2017

1995 Mercedes-Benz SL-Class

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

Excellent if you are keeping factory Bose speakers and amps in Mercedes. Do get 4V or 5V output unit, this way no need to use the Scosche adapter in addition to this one (to match the output), this one becomes a perfect adapter. And when you are ready to ditch the Bose and replace everything (in time), still usable, just unplug it's RCA lines from the head unit Also, unlike other brands, Metra got the Power switched and Power continuous right!

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

perfect adapter to simplify the job

byron from Beaverton, OR on 3/8/2017

2003 Mercedes-Benz SLK-Class

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

made the job of adapting my stock harness to my aftermarket radio easy. the harness wires came with enough instructions to easily mate the aftermarket radio. my only problem was that the adapter harness came with rca plugs for the speaker/amplifier connections. my stock radio harness didn't utilize rca plugs. i simply cut off the plugs and did a direct wire to wire connection for the speaker outputs.

Pros: no need to cut your existing stock harness wiring.

Cons: none

Crutchfield response on

0 of 0 found this helpful

Almost a home run

Timothy from Lexington,SC on 1/30/2017

1998 Mercedes-Benz SLK-Class

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

Easy install.

Pros: Fit my car

Cons: Had to use RCA converter for speakers.

Crutchfield response on

0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from Ellicott City, MD on 1/19/2017

2016 Ford F-150 XLT

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

This item really simplified my install. On my car (2002 MB E320) accessory power had no connection so I had to tap it off of Cig. lighter.

Pros:

Cons:

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0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from Clearwater, FL on 12/26/2016

2000 Land Rover Discovery

Verified customer (What's this?)
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Worked as designed.

Pros:

Cons:

Crutchfield response on

2 of 3 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from Polkville, NC on 12/13/2016

1998 Mercedes-Benz SLK-Class

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

Exact fit for my Mercedes. Easy instructions for correct connections.

Pros:

Cons:

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0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from Rancho Santa Margarita, CA on 11/29/2016

2000 Mercedes-Benz SLK-Class

Verified customer (What's this?)
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Excellent fit, easy installation. - worked out perfect !

Pros:

Cons:

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0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Bob from Shady Side, MD on 11/23/2016

1999 Mercedes-Benz ML320

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

Perfect connection harness for my older car. Easy to install.

Pros: easy to connect perfect fit free with Kenwood receiver purchase

Cons: none

Crutchfield response on

0 of 0 found this helpful

Great sound

David from Springfield, VA on 9/22/2016

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

Can't get any easier. Thank Norm (Crutchfield) for your advise.

Pros: Make installation easy.

Cons: None

Crutchfield response on

0 of 0 found this helpful

Makes installation of a new radio very easy

EngineerBill from Los Altos, CA on 9/12/2016

1997 Mercedes-Benz C-Class

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

Doesn't get any easier than this! Just plug the existing connector in the car into this cable and plug in the 4 audio jacks into the level shift adapter. Connect the remaining wires on this adapter to the same color wires coming out of the cable from the new radio and everything works!

Pros: Quick, straightforward, and it WORKS with no hassle.

Cons: None I can think of.

Crutchfield response on

0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

steve & suellen from Santa Rosa, CA on 8/14/2016

1997 Mercedes-Benz SL-Class

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

Once I got over my fear of doing something wrong, I got out the soldering iron and heat shrink and mated this harness to the one that came with the Kenwood head unit. No drama, no fuss, it just worked. Thanks, Crutchfield!

Pros:

Cons:

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0 of 0 found this helpful

Works great

Stephen from Louisville, KY on 7/24/2016

2001 Mercedes-Benz SLK-Class

Verified customer (What's this?)
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Made installing my stereo a breeze. Didn't even need any directions.

Pros: Simple and works great

Cons: None

Crutchfield response on

0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Lib N from Hiawassee, GA on 7/8/2016

2002 Mercedes-Benz SLK-Class

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

Fits and works fine. I could have used a little more information on the excess wiring on the car. However, the Crutchfield tech rep I called was very good and things were sorted out in no time

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Worked great!

Daniel from Nashville, TN on 6/2/2016

2004 Chrysler Crossfire

Verified customer (What's this?)
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Did exactly what it was supposed to do - very easy to use.

Pros: Worked perfectly, wires came pre-sheathed for easy connection to the stereo harness

Cons: None

Crutchfield response on

1 of 1 found this helpful

Works great

Doug from Minnesota on 3/6/2016

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

I installed a new hu in my slk 230 with the factory Bose amps. This eliminated the popping noises when I changed inputs or other settings.

Pros: Cheap, works great. Easy install.

Cons: None

Crutchfield response on

0 of 0 found this helpful

Installation doesn't get any easier

Chris from Sacramento, CA on 2/29/2016

2003 Land Rover Discovery

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

The Metra 70-1786 harness plugged right into the stock harness on my factory amp equipped '03 Land Rover Discovery II and everything works great!

Pros: RCA's for preamp equipped head units

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from New York on 12/7/2015

1994 Mercedes-Benz C-Class

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

perfect fit no splicing requiered

Pros: no wiring needed

Cons: none

Crutchfield response on

1 of 1 found this helpful

Easy clip on

Ryan from Missouri on 10/4/2015

2005 Chrysler Crossfire

Verified customer (What's this?)
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Crossfire 2005 wires fit perfectly

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

Crutchfield comes through.

Kris from Maryland on 9/12/2015

1999 Mercedes-Benz E-Class

Verified customer (What's this?)
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Crutchfield makes it easy to get parts I need.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

If recommended by Crutchfield, then its a simple swap

Matt from Toronto, Ontario on 9/7/2015

2000 Mercedes-Benz SL-Class

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

Fitment and product matching was perfect as per Crutchfield's recommendation.

Pros: Wiring layout on package. Product seems the be well built

Cons: Possible extensions must be made if using a line-output converter.

Crutchfield response on

1 of 1 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from New York on 8/30/2015

1995 Mercedes-Benz SL-Class

Verified customer (What's this?)
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A+++

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Excellent Item but vague instructions

halligood from Pennsylvania on 4/19/2015

2002 Mercedes-Benz SLK-Class

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

This was exactly the item that I needed, but it took me a day or so to figure it out. I had quite a few wires that were not needed and had to be tied off. Since it was my first attempt at such a task, I attribute my ignorance to inexperience. Since installing, I have had a half dozen friends want to modify their vehicles exactly as I did. That is a compliment towards the effectiveness of your product.

Pros: perfect interface once you figure out the wiring.

Cons: None really. If I had to do this again my 2 day project would be a 30 minute project.

Crutchfield response on

0 of 0 found this helpful

Great Products

MM from Cape Charles, Va on 4/8/2015

Verified customer (What's this?)
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Great product, perfect fit! My favorite thing is that Crutchfield sends a MasterSheet with instructions and diagrams!

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Meta harness

DEEBEE from North Carolina on 2/22/2015

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

Easy to install, does what it is supposed to do. I had a setting off in my Kenwood which when synched to iphone6 only played music on front speakers. Called the team at Crutchfield and it was just a setting change not the harness. Crutchfield, your support is the best

Pros: Easy to install and it works

Cons: Absolutely none

Crutchfield response on

1 of 1 found this helpful

Perfect Fit

Mr. G from Baltimore, Maryland on 2/9/2015

1999 Mercedes-Benz ML320

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

This harness fit perfectly as part of my after market sound system per the advice of the experts at Crutchfield. I was thoroughly satisfied with the easy fit between the Pioneer CD receiver and the factory Bose system.

Pros: Excellent fit, easy connection.

Cons: Happy to say no cons!

Crutchfield response on

1 of 1 found this helpful

Easy to use

Jason from Cartersville, GA on 1/23/2015

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

This product worked perfect with my set up.

Pros: Great product

Cons: None

Crutchfield response on

1 of 1 found this helpful

Adapter for 01 Mercedes SLK

MichaelT from California on 1/9/2015

2001 Mercedes-Benz SLK-Class

Verified customer (What's this?)
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Perfect fit. Made installation quick and easy.

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Metra 70-1786 Receiver Wiring Harness

t3ragtop from Ohio on 12/30/2014

1998 Mercedes-Benz SLK-Class

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

This wiring harness adapter made my installation painless and left my car's wiring intact. The wiring diagram that Crutchfield sent by email made it easy to connect the head unit's wiring correctly and without issue.

Pros: The proper connections make a neat and tidy installation.

Cons:

Crutchfield response on

1 of 1 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from Rialto Ca 92376 on 11/17/2014

Verified customer (What's this?)
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Easy to connect

Pros: Best thing ever

Cons: No con

Crutchfield response on

1 of 1 found this helpful

Excellent product

Crutchfield customer from the Washington, DC Area on 11/6/2014

2001 Mercedes-Benz E-Class

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

This harness made adding my new head unit to my Mercedes. Super easy and works great.

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Metra 70-1786 Receiver Wiring Harness

Mike R from Boston, MA on 10/16/2014

1999 Mercedes-Benz SL-Class

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

Where the heck were these things years ago? These wiring harnesses are great for a neat and professional installation that allow switching back to the original setup if needed (classic car, keep original radio, etc.). Take your time, use soldered connections sealed with shrink tubing and you'll have a super setup.

Pros: Instructions for my specific application were not available. Hunting around in the various forums gave me enough information to make it work the first time.

Cons: Lacked a "Master Sheet" for my application (1999 Mercedes SL500)

Crutchfield response on

1 of 1 found this helpful

metra 70-1786 harness

Avi from Ashland OH on 9/24/2014

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

Perfect fit. Easy to install. Free with head unit purchase.

Pros: Perfect fit

Cons: None

Crutchfield response on

1 of 1 found this helpful

Metra 70-1786 Wiring Harness

EugeneB from Knoxville, TN on 8/22/2014

2004 Chrysler Crossfire

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

This harness was a perfect fit and easy to wire to the harness that came with my radio. The wires were color coded to match the color of the Alpine harness, making the wiring job easy. It would have been better if the instructions had said to plug the front speaker jacks into the front ports, and the rear jacks into the subwoofer ports on the radio. My Crossfire does not have rear speakers, it has rear subwoofers.

Pros: color coded wires

Cons: none

Crutchfield response on

2 of 2 found this helpful

Works great for 2004 Chrysler Crossfire

MBD from Texas on 7/26/2014

2004 Chrysler Crossfire

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

I got this for a 2004 Chrysler Crossfire, which is essentially a Mercedes since it was built in Germany by Mercedes for Chrysler. which was owned at the time by Daimler (Mercedes). Anyway, this connector made the job installing my stereo (Clarion M502) much easier since it doesn't require the cutting or splicing of wires. You just wire this connecter to the connector that plugs in the back of the new stereo and plug it in.

Pros: Simple & Doesn't require cutting any wires.

Cons: Nothing really except I saw where the materials that this is made of of is known to cause cancer in the state of California. Good thing I'm in Texas.....LOL.... Seriously why would they make anything out of lead paint or whatever. I just washed my hands after touching it and now I'm enjoying my new Clarion Stereo.

Crutchfield response on

2 of 2 found this helpful

plug and play

Doc from Hermiston Oregon on 7/25/2014

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

The local shop wanted $300 because I had a Mercedes Benz e430 with a Bose premium system to install the new deck that I already bought. I called Crutchfield they sent me the plug and play wire harness for this price and I had it installed in 20 min. awesome customer service awesome product

Pros: plug and play

Cons: none

Crutchfield response on

1 of 1 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from warren, pa on 6/14/2014

Verified customer (What's this?)
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works good but seems like power is low going out of rcas but it does work and easy to hook up

Pros: easy connection

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1786 Receiver Wire Harness Review

SteveCP from Sacramento, CA on 5/5/2014

2000 Mercedes-Benz E-Class

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

A simple, easy to use installation harness to provide a professional installation. A necessity in providing a correct, straight-forward installation of an aftermarket radio.

Pros: Takes some of the guesswork out of matching the correct wires to complete your installation without changing the original connector harness in my vehicle. Very nice that Crutchfield makes this available at no charge when purchasing your new radio!

Cons: Not all of the connections and signals match this wiring harness adapter and not all of the Crutchfield provided instructions were accurate to my vehicle. Most importantly, the switched power lead is in the wrong location to use this harness. An additional power lead had to be added.

Crutchfield response on

0 of 0 found this helpful

Metra 70-1786 Receiver Wiring Harness

Carlos from welford on 4/22/2014

2001 Saab 9-5

Verified customer (What's this?)
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Received in a timely manner, and product works great. Also i like the professionalism and how fast the person on the phone found my part.

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

2001 Mercedes E430

Baro from Renton, WA on 4/19/2014

2001 Mercedes-Benz E-Class

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

It worked with little bit of work. My 2001 Mercedes E430 didn't have switched power on and dimming wire coming from the car. I had to connect switched on power wire from cigarette plug to make it work. Also I need to get dimming light wire connection from the light switch.

Pros: Plug in

Cons: Didn't connect to my car's switched power on wire.

Crutchfield response on

2 of 2 found this helpful

Game Changer

Jimmy J from Vail, AZ on 4/8/2014

1997 Mercedes-Benz SL-Class

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

Saved me hundreds on install. Local shops wanted to do a custom install, because Alpine did not show a compatible harness...guess they for got to ask you guys and girls. The harness made it a simple "plug and play"

Pros: Easy diagram to follow. Wired at kitchen table.

Cons:

Crutchfield response on

1 of 1 found this helpful

Worked well

Uncle Sam from Denver, CO on 3/25/2014

2004 Chrysler Crossfire

Verified customer (What's this?)
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Worked just fine. I was able to remove the pins from this harness using a tiny screwdriver and re-crimp the wires on the stereo harness onto the pins.

Pros: Good quality, wired correctly for the Chrysler Crossfire.

Cons: I wish that harness makers would include a spare set of pins for the harness so that I can make the harness using the radio's wiring loom. When done this way there is no soldering and it works/looks excellently. I ended up pulling the pins from the harness and removing the harness supplied wires to make this happen.

Crutchfield response on

2 of 2 found this helpful

Worked like a charm

RickM from Olympia, WA on 2/5/2014

1999 Mercedes-Benz SLK-Class

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

Crutchfield provided it, free of charge, I connected it to my Alpine unit (purchased through Crutchfield) and it worked beautifully the moment I turned the unit on. This is in stark contrast to a Kenwood unit and harness I purchased from other suppliers, which gave me a hot popping sound every time I changed stations, sources, or songs. Crutchfield gave me the combination of products that worked flawlessly together.

Pros: Easy, fast, it works.

Cons: Nada

Crutchfield response on

1 of 1 found this helpful

Metra 70-1786 Receiver Wiring Harness

Alzonez from 11105 on 1/2/2014

2001 Mercedes-Benz E-Class

Verified customer (What's this?)
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Makes life easy!

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Easy

bserrone from Raleigh NC on 12/29/2013

1996 Mercedes-Benz E-Class

Verified customer (What's this?)
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Great fit. Crutchfield made it easy!! The rep loaded my cart with everything I needed. Trust the tech!!

Pros: Easy as pie. Mmmmmm! Pie!!

Cons:

Crutchfield response on

1 of 1 found this helpful

Excellent Fit

Crutchfield customer from Vancouver, WA on 12/11/2013

2000 Mercedes-Benz E-Class

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

Used this in an Alpine install into a Mercedes and it matched the factory connector well. The instructions included said I would have to cut the factory connector but that was not the case. The plugged in with zero modification needed.

Pros: Using this helps keep the factory wiring uncut. Good fit to the factory plug.

Cons:

Crutchfield response on

1 of 1 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from Los Angeles, CA on 10/29/2013

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

Random but this my save you some frustration: If you have a Mercedes 230 SLK (R170), you do not need the rear outputs from the head unit. While this harness has rear RCAs, they don't actually lead anywhere after you connect the Crutchfield harness to the factory harness. It works fine because the signal from the front outputs goes to the car's built-in amp, which powers both front and rear speakers. This can be really confusing because your fader will not work and you might think there's a problem with the rear speakers or wiring. But your fader never actually worked. Who needs a fader in a 2-seat roadster? Also, remember to get posi caps and an antenna adapter.

Pros: Works, simple, easy. Amazing customer service from Crutchfield, that's hands down the best part.

Cons:

Crutchfield response on

1 of 1 found this helpful

Fits Mercedes well

Troy from Lady Lake, FL on 10/15/2013

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

Fit perfectly.

Pros: Good quality and fits perfectly

Cons: none

Crutchfield response on

1 of 1 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from Charlevoix, MI on 8/20/2013

2000 Mercedes-Benz SLK-Class

Verified customer (What's this?)
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With this plug installation couldn't been easier!

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

execellent

DickF from Naples, FL on 8/5/2013

2005 Chrysler Crossfire

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

Exactly fit my Crossfire wiring

Pros: Perfect fit

Cons: none

Crutchfield response on

1 of 1 found this helpful

Metra 70-1786 Receiver Wiring Harness

Tom from Longwwod, FL on 6/19/2013

2005 Chrysler Crossfire

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

very simple to use although the instructions could be a little more detailed.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Receiver Wire Harness

Ron from Ridgeland, MS on 6/12/2013

2005 Chrysler Crossfire

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

Harness worked as advertised, however I still had to cut the speaker wires due to the having rca connectors on the end.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

This Makes ALL The Difference

Manny from Veradale, WA on 6/11/2013

Verified customer (What's this?)
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Changing the unit would not be happening without this harness.

Pros: The only way to go.

Cons:

Crutchfield response on

1 of 1 found this helpful

Metra 70-1786 Receiver Wiring Harness

Crutchfield customer from Iowa Park, TX on 5/27/2013

2000 Mercedes-Benz C-Class

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

Easy install and work perfectly. Thanks Crutchfield

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Receiver wire harness

Mbg319 from Fort Scott, KS on 5/23/2013

2006 Chrysler Crossfire

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

Works great made the installation a breeze. Once I had the harness wired to new receiver it took about 10 minuets to install the receiver.

Pros: Makes the install super easy

Cons: None

Crutchfield response on

1 of 1 found this helpful

it works

nickmang from nashville, tn on 5/12/2013

1997 Mercedes-Benz C-Class

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

It works as it should, wire coding matched lined up well with car and stereo.

Pros: it's works

Cons: none

Crutchfield response on

1 of 1 found this helpful

Chrysler Crossfire and JVC KD-80BT

RJB from San Antonio, TX on 5/1/2013

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

This harness made the unit "plug & play".

Pros: It works.

Cons: None.

Crutchfield response on

1 of 1 found this helpful

Perfect Fit

Peterson from Tampa,FL. on 3/12/2013

2002 Mercedes-Benz E-Class

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

This was included with the radio I purchased. It was setup to work with my vehicle and the Bose system that was already in the vehicle. I connected the wires to the radio and was able to plug the unit right in when I installed it. Everything works perfectly. The only issue was that there is no accessory power (red wire) in the oem harness. The plug has a spot for it but there was nothing on the vehicle side. I ended up running power from the cigarette lighter supply. This has nothing to do with the harness kit, it is an issue with the car itself. The factory head unit got power from another source.

Pros: Plugs right in and had the rca jacks to plug right into the pre-outs on the head unit. I did not have to connect one speaker wire.

Cons: None

Crutchfield response on

1 of 1 found this helpful

Perfect fit

Alex J. from Miami, FL on 2/28/2013

1999 Mercedes-Benz S-Class

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

This connector was a perfect fit to my Bose amplifier. All the 12 stock speakers are rocking aloud

Pros:

Cons: None

Crutchfield response on

1 of 1 found this helpful

Perfect Fit

JP from Apollo Beach, FL on 2/28/2013

2003 Mercedes-Benz SLK-Class

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

A perfect fit, just plug and play! After reading forum posts and wiring it accordingly (was told to switch a couple of power wires), found out the wiring on this connector was correct all along. So much for 'expert' forum installers..ha, ha. This is the reason to go with Crutchfield and no one else!!!

Pros: Perfect fit for my application

Cons:

Crutchfield response on

1 of 1 found this helpful

Not so good

Bob B from New York on 1/4/2013

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

This harness is not worth the aggravation it caused, even for free. The RCA connectors are too loose and nearly fall off the back of the HU. They made poor contact, leading to excessive alternator noise entering the amplifier loop. I eventually removed this adapter it and replaced it with a higher quality unit that I purchased elsewhere; doing this dramatically reduced the alternator noise. I would give 0 stars if I could. Application was a Mercedes C280 with Bose amp.

Pros: Free with order.

Cons: RCA connectors are very poor quality.

Crutchfield response on

0 of 1 found this helpful

Cant get any easier

Nate from NJ on 12/22/2012

2004 Land Rover Discovery

Verified customer (What's this?)
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Must Must have for land rover if keeping factory speaker system.

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

Fits R170 SLK

Crutchfield customer from White Plains, NY on 9/5/2012

2001 Mercedes-Benz SLK-Class

Verified customer (What's this?)
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Like described.

Pros:

Cons:

Crutchfield response on

3 of 3 found this helpful

Receiver wire harness

Masi from Costa Mesa, CA on 8/17/2012

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

The harness made it easy to make the required connections.

Pros: After making sure that the wiring connections were secure, it will be there forever!

Cons: None

Crutchfield response on

1 of 1 found this helpful

Wrong item-but was fixed

Mark from Jamesport, NY on 4/30/2012

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

The wrong item was sent, called Crutchfeild. They immediatedly sent out the correct one, got it two days later and in went the new radio!

Pros: Crutchfield immediatedly fixed problem

Cons: Wrong item

Crutchfield response on

0 of 0 found this helpful

Much Needed

Lee from Newnan, GA on 2/2/2012

1995 Mercedes-Benz SL-Class

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

This product solves connection issues with Euro vehicles when connecting American / Asian head units.I used it in my Mercedes and all the factory speakers and amp now work with the new CD player.

Pros: Easy and accurate connection harness and quality RCA jacks.

Cons: I think the connecting wires could be longer for some applications.

Crutchfield response on

4 of 4 found this helpful

Garbage

Doug from Seattle on 11/3/2011

2001 Mercedes-Benz E-Class

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

When I tried to install the radio the harness plugged in OK but the wire match was not exact. After talking to company reps additional wiring was required beyond the harness. One of the suggested fixes was jumpering the power to constant power and just remembering to turn off the radio when I left the car.

Pros: The way Critchfield misled me

Cons: It did not work

Crutchfield response on

0 of 2 found this helpful

Mercedes Advice

Hotmann from Colorado on 10/31/2011

2001 Mercedes-Benz E-Class

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

I have a 2001 Mercedes E320 and this wiring harness fits everything perfect. Some advice though for Mercedes owners: If the stock connectors don't have a line going into the switched power (red) line on the harness you will have to tie into the cigarette lighter's switched power source. To access this: lift the wood around the shifter knob up (the whole thing with the window controls and everything)so that you can access the two screws that hold the ash tray in place. Unscrew and pull out the ash tray. You will see a yellow/black wire, hook into that with a 8"+ wire and pull it up behind and through the cd slot. Connect that to the switch power wire for the stereo and enjoy.

Pros: Saved me lots of time. Only had to solder the power wires and didn't have to lookup the car's wiring info.

Cons: Nothing.

Crutchfield response on

5 of 5 found this helpful

Mercedes harness

Glenn from Durham on 10/2/2011

1995 Mercedes-Benz S-Class

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

One of the best things about Crutchfield is supplying a harness such as this one with the purchase of a head unit. Harness was perfect to allow use of the Bose amplifier without needing to read a wiring diagram to splice everything in place. Thanks for saving me a lot of anguish.

Pros:

Cons:

Crutchfield response on

4 of 4 found this helpful

Saved some time... but

DanD from Atanta, GA on 4/11/2011

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

It plugged right into my factory harness, so that's cool because it's clean and saves you from having to splice. Unfortunately, the "always on" and "Ignition on" leads were reversed from those on my car. It took a little investigation to figure that out. Also, the left rear speaker connection is flacky, so you should make sure the connections are good, before you cram all those wires into the dash.

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

jimpro

jimp from bennington,vt on 3/24/2011

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

product was as described, easy to self install, product manual not the easiest to understand, happy w/product and purchase

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Real nice

Tim from Vermilion Ohio on 3/15/2011

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

This harness is very well made, and plugged right in, can't ask for any more than that

Pros:

Cons:

Crutchfield response on

3 of 4 found this helpful

Verified customer (What's this?)
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Pros:

Cons:

Crutchfield response

<< >>

More details on the Metra 70-1786 Receiver Wiring Harness

Stacey B.

Product Research

Features

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

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

Wiring Notes: If the Crutchfield 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 vehicle's may require you to bypass the vehicle's factory amplifier (in another location from factory radio) or hardwire certain connections. If your vehicle is equipped with factory steering wheel controls, an additional adapter is required & sold separately.

Wire Code Chart:

Wire Color Function
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Ground
Blue/White Amp Turn-On
Orange/White Dimmer
White RCA Left Front Channel
Gray RCA Right Front Channel
Green RCA Left Rear Channel
Violet RCA Right Rear Channel

Factory Amp Note: This harness includes RCA connections (instead of speaker wire leads) to connect the aftermarket head unit's preamp outputs to your vehicle's factory amp. Your aftermarket head unit must be equipped with front & rear preamp outputs.

The Crutchfield Car Selector: Please visit the Crutchfield Car Selector for your specific type of vehicle.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
need them [ Emmett  Aug 02, 2019 ]
A
Came with the recommended install kit. [ John  Jun 04, 2019 ]
A
fits my car [ Donald  Mar 08, 2019 ]
A
Easy install [ Harold  Mar 06, 2019 ]
A
For a clean install [ EUGENE  Feb 10, 2019 ]
A
Needed for installation to allow the bose amplifier to work with aftermarket unit. [ Browne  Dec 11, 2018 ]
A
Gift [ Lisa  Dec 10, 2018 ]
A
this was realy needed and it was free [ DEREK  Nov 21, 2018 ]
A
so you don't have to cut the original wiring. [ WALTER  Oct 19, 2018 ]
A
NEED IT [ DOUGLAS  Oct 01, 2018 ]
A
Cause it fits my car [ keith  Sep 28, 2018 ]
A
Makes installation simple [ Randy  Aug 26, 2018 ]
A
Adam recommended it [ Curtis  May 09, 2018 ]
A
Make the job easier [ Elizabeth  Feb 01, 2018 ]
A
Needed equipment to complete installation. [ KEVIN  Jan 12, 2018 ]
A
Because it was recommended for this installation. [ Duane  Nov 27, 2017 ]
A
I needed a receiver wiring harness because I didn't want to hack the factory wiring. [ Michael Wayne  Nov 25, 2017 ]
A
required to use existing amp and subwoofer in vehicle. [ Chris  Nov 21, 2017 ]
A
Crutchfield recommended it. [ Bradley  Nov 18, 2017 ]
A
Supplied with installation kit. Best way to connect aftermarket head unit to factory wiring harness without cutting wires. I've used these type of connectors many times without problems. I suggest taking the time to use solder and heat shrink wrap to insure the best possible connection. [ James  Nov 05, 2017 ]
A
Part of installation bundle [ GREGG  Oct 26, 2017 ]
A
NEEDED IT [ MELVIN  Sep 19, 2017 ]
A
Been using Crutchfield for 30 years, even for the 12 years I had a professional audio installation shop. If they say this is a good idea, go ahead and get it. [ Domingo  Sep 12, 2017 ]
A
Recommended [ Barbara  Sep 05, 2017 ]
A
Installing a radio [ Amberley  Sep 04, 2017 ]
A
part of the install kit [ Thomas  Aug 20, 2017 ]
A
To radio system in my car [ Jeffrey  Jul 13, 2017 ]
A
To ensure that the factory wiring was compatible with the head unit. [ Wendell  Apr 16, 2017 ]
A
recomended [ G  Feb 15, 2017 ]
A
said i needed it [ JOHN  Dec 30, 2016 ]
A
recommended [ Eugene  Nov 30, 2016 ]
A
Just makes life easier so I can solder the radio wires to the harness on my bench in the garage and then hook everything up quickly in the car. [ Big Daddy Dave  Oct 15, 2016 ]
A
Suggested for my car [ Tony  Oct 05, 2016 ]
A
Fixing the installation of my radio (done by a chain store). [ Jeffrey Jay  Sep 17, 2016 ]
A
To install a previous Crutchfield purchase into a different vehicle [ Ken  Sep 03, 2016 ]
A
Needed for the install [ B  Aug 25, 2016 ]
A
because mine 70-1784 doesn't work with my bose and i stated that when i bought now im stuck with it i guess [ EDMOND  Jul 29, 2016 ]
A
Needed item to install new radio [ John  Jul 26, 2016 ]
A
Required to retain use of factory Bose system [ Roderick  Jul 17, 2016 ]
A
Must have to connect to existing harness. [ Itay  Jun 02, 2016 ]
A
Needed for installation. [ Tristan  Jun 01, 2016 ]
A
no cutting original wires [ Rafael  May 05, 2016 ]
A
So i will not cut any wires on my vehicle [ HERIBERTO  Apr 21, 2016 ]
A
only place that had it [ ROBERT A  Apr 01, 2016 ]
A
Install in Mercedes Benz [ Graham F.  Mar 13, 2016 ]
A
I needed an adapter and the price was reasonable for a name brand product. [ James  Feb 11, 2016 ]
A
To keep from damaging factory harness incase I reinstall original unit [ Michael  Dec 19, 2015 ]
A
Made wiring connections quick and easy [ Andrew  Dec 05, 2015 ]
SHOW MORESHOW LESS

2 questions already asked

Q
do you have a specific diagram show how to properly connect my Kenwood KDC-X599 to a Metra 70-1786 adapter?
[ Craig  Jul 02, 2016 ]
1 answer
A
Yes the harness kit came with a wiring diagram so you could easily connect the cortect wires together. I had no problem doing/ following the diagram
[ Gabriel  Jul 03, 2016 ]
Q
This harness has a two-row block with 8 pins and another for 5 pins. That all fits perfectly, but I also have a separate, thinner but longer block that was in the stock radio, and now has nowhere to go... Car is 1997 Mercedes S320 with a Becker stock radio.any ideas?
[ David  Dec 03, 2014 ]
1 answer
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. 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/.
[ Jeff  Dec 03, 2014 ]  Staff

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