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Metra 70-1785 Receiver Wiring Harness

Connect a new car stereo in select 1988-95 Volkswagen and Audi models

Item # 120701785

The Metra 70-1785 wiring harness makes connections between your new car stereo and your car's electrical system.

Find what Fits your car

The Metra 70-1785 wiring harness makes connections between your new car stereo and your car's electrical system.

California customers:
Please click here for your Proposition 65 warning.

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Item # 120701785

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$24.99
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About the Metra 70-1785 Receiver Wiring Harness

Metra 70-1785 Receiver Wiring Harness

The Metra 70-1785 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.

Metra 70-1785 Receiver Wiring Harness

The Metra 70-1785 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.

Once this harness is connected to your new stereo, you'll be able to plug right into your car's factory radio connector. In order to use your factory amplifier, you'll have to connect the RCA connectors on this harness to the preamp outputs on your new receiver – you'll want to pick a car stereo with at least two sets of preamp outputs (front and rear).

This harness makes installing your new stereo easier, and allows you to put the factory radio back if you sell your vehicle. A detailed instruction sheet comes with the harness. Please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this adapter is compatible with your vehicle. Warranty: 60 days.

Installation Note: This harness uses your factory amplifier; your new receiver must have front and rear preamp outputs to connect this harness.

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:

  • 7" Vehicle/radio harness
  • 11" RCA harness
  • 7" Blue/white wire lead
  • 7" Blue wire lead
MFR #70-1785

Customer reviews

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Metra 70-1785 Receiver Wiring Harness reviews

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Don't Cut That Harness!

Crutchfield customer from Vancouver, WA on 4/26/2019

1990 Audi 80

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Verified employee purchase (What's this?)

I recently purchased a mint older Audi with a Wiesbaden code protected AM/FM cassette unit and separately amplified speakers/dual antenna system. Putting in a modern Car Play compatible deck would have entailed a lot of hacking into the OEM harness without this adapter. Crutchfield supplied everything I needed to build a plug and play harness which works perfectly without making a mess of the existing wiring. (including an antenna adapter and interposing relay to power the antenna and speaker amplifiers without overloading the decks 300mA switched lead. ) Soldered/heatshrinked and tesa tape covered the harness adapter for a true factory level install.

Pros: Clean install which doesn't ruin existing car harness.

Cons: After checking existing wiring, I needed to relocate a pin in the adapter harness which did not match supplied documentation.

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Plug and Play!

Jaffray from Hollywood, MD on 12/12/2017

1990 Audi 200 Quattro

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Unbelievable!!! I soldered this to the pigtail that came with the Sony, and it was Plug and Play!!!

Pros: Easy!!!

Cons: None

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0 of 0 found this helpful

On a 993

Crutchfield customer from San Francisco, CA on 10/13/2017

1995 Porsche 911 Carrera

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It's a combined A+B socket, plus a C socket with RCA's. The instructions were on the packet, plus a torn-off paper strip in the bag - they were for Audi and VM installs. They could have been better written, so 4 not 5 stars. On the 993, the amp-remote-on goes in the C socket, not the A socket as specified in the Audi+VM instructions.

Pros: It works

Cons:

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A necessity!

KKimes from Pennsylvania on 3/24/2015

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This wire harness was a necessity when installing the new radio. I had to order it through Crutchfield because I couldn't find this locally for my 1992 Cabriolet. So glad Crutchfield carried the model!

Pros: Everything

Cons: Nothing

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didn't even work

Crutchfield customer from fargo on 3/3/2015

1993 Audi 90

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They said it'd fit my car... it didn't

Pros:

Cons: Clearly didn't work as described only powered front speakers

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Pros:

Cons:

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More details on the Metra 70-1785 Receiver Wiring Harness

Stacey B.

Product Research

Features

Wiring Harness: This wiring harness prevents 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 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 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 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 and sold separately.

Wire Code Chart:

Vehicle/Radio Harness

Wire Color Function
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Chassis Ground
Blue/white Amp Turn-On
Orange/white Illumination
White Left Front Speaker +
White/Black Left Front Speaker -
Gray Right Front Speaker +
Gray/Black Right Front Speaker -
Green Left Rear Speaker +
Green/Black Left Rear Speaker -
Violet Right Rear Speaker +
Violet/Black Right Rear Speaker -

Preamp/RCA Harness

RCA Color Function
White Left Front Speaker Channel
Gray Right Front Speaker Channel
Green Left Rear Speaker Channel
Violet Right Rear Speaker Channel
Note: Your aftermarket head unit will need to be equipped with four preamp/RCA outputs.

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Customer Q&A

1 question already asked

Q
The instructions show to put the blue/white remote wire into pin5 of 16 pin harness but there is no pin diagram. Where is pin5?
[ Luke  Feb 24, 2015 ]
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. 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/.
[ Krissy  Feb 24, 2015 ]  Staff

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