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Metra 70-1759 Receiver Wiring Harness

Connect a new car stereo in select 1988-95 Audi vehicles

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Item # 120701759

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

Metra 70-1759 Receiver Wiring 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.


Notes: The 12V switched power lead may not be present in your car. If not, and your receiver requires a switched 12V lead (most do), run a wire to an appropriate fused switched circuit. The rear speaker negatives are electrically the same for the left and right side speakers. Most aftermarket receivers (and all that Crutchfield sells) will need an additional adapter, or you may run new speaker wires from your receiver to the speakers - see "Accessories" for speaker wire. You may also require a relay to operate the factory amp (if present).

  • 12V constant power
  • chassis ground
  • power antenna turn-on
  • dimmer
  • left front speaker +/-
  • right front speaker +/-
  • left rear speaker +
  • right rear speaker +
  • left and right rear speakers -

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so. You can also call an Advisor for more information.

What's in the Box:

  • 8" Power/front speaker harness
  • 7.5" Rear speaker harness
  • Instructions

Hands-on research

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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:

(Power/Front Speaker Harness)

Wire ColorFunction
Yellow+12 Volt Constant
BluePower Antenna
WhiteLeft Front Speaker +
White/BlackLeft Front Speaker -
GrayRight Front Speaker +
Gray/BlackRight Front Speaker -

(Rear Speaker Harness)      

Wire ColorFunction
GreenLeft Rear Speaker +
VioletRight Rear Speaker +
BlackSpeaker Negative (common ground)

No Switched Power: This harness contains no 12-volt switched power lead. You must connect the 12-volt switched & constant power lead of your aftermarket head unit's harness to the 12-volt constant wire of this harness.

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

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.