Metra 70-1858L Receiver Wiring Harness

Connect a new car stereo in select 1988-94 Buick and Pontiac vehicles

Item #: 120701858L

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Metra 70-1858L 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 saves installation time since you won't have to cut factory wires individually, and this also enables you to re-install the factory radio if needed. 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.

Connections:

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

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

Hands-on research

What's in the box?

Download owner's manual

  • Receiver wiring harness
  • Instructions

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 Power Antenna/Amp Turn-On
Empty (none)
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 -

The Crutchfield Car Selector: Please visit the Crutchfield 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 open the box, verify contents, 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.

Metra 70-1858L Receiver Wiring Harness Reviews

Average Customer Review:

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Wire harness

Written By Perry, Minot, ND on Tuesday, August 26, 2014

Crutchfield Customer Review (What's this?)

Works and fits perfectly

Pros: Makes hook up a breeze.

Perfect fit

Written By Todd, Texas on Wednesday, January 29, 2014

Crutchfield Customer Review (What's this?)

Fit effect, great length.

Does Not Fit

Written By Bend3r117, Huntsville,Al on Thursday, January 03, 2013

I have a 92 Buick Regal, This harness does nothing for me. The plugs on my car cannot in no way fir this harness. Ever. The picture on the web site of the 92 regal inter. is not even right. Dont know whats going on here???? Suppose to Fit they say, Whatever!!

Pros: Came to me fast.

Cons: will not fit car, despite the info provided

Not good for buick 1988 installation

Written By Snook, Columbus, Ohio on Wednesday, October 10, 2012

Crutchfield Customer Review (What's this?)

bought this product about a week ago.waited for it to come in the mail. finally came in. unistalled my factory radio and cassette player...the harness was long enough but the plugs that are spose to slide into this harness were bigger than the end of harness which was very upsetting.

Pros: got to my house on the right day.

Cons: couldnt have been the right size for a buick regal 1988 because the plugs that go into the hardness were bigger.

Buy it!

Written By Ron, Morton, PA on Friday, February 17, 2012

Crutchfield Customer Review (What's this?)

This harness makes the installation of an aftermarket radio a breeze! Save yourself a LOT of aggrevation and get it!

Pros: Each wire is labeled, plugs right in to existing harness.

Cons: none.

Old car - new radio

Written By charlie1593, Mt. Olive Twsp. NJ on Tuesday, September 07, 2010

Crutchfield Customer Review (What's this?)

The harness made installing a new radio a snap.
I installed a Pioneer CD receiver into a '91 Buick Regal which came with a factory 3 piece sound system.
The wiring set up from Crutchfield, AND the advice they gave me, made the job a snap.
Thanks Crutchfield, you've done it again.

Not good for a Corvette installation

Written By Mark, Mary Esther, FL on Monday, February 09, 2009

Crutchfield Customer Review (What's this?)

This factory adaptor is not compatible with how GM wired the radio in the 95 Corvette. Basically, I do not have a BOSE system but the radio still wires to a amp/box in the rear storage compartment, similar to the BOSE system. This supplied harness does not resemble the 7 & 9 pin connectors attached to the factory. Of course there is another harness available to order after I totally tore apart my dash to install the radio! I should get it in a week or so and I'll try again!

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