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American International GWH-343

Connects an Aftermarket Receiver to Factory Plug on Select 1988-2005 General Motors Vehicles


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This item has been discontinued

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When replacing your factory radio with an after-market car stereo, the GWH-343 wire harness is a must for a quick and clean installation. It eliminates cutting your OE radio plug. After connecting it, your install is simple as the wires will color-match and easily connect to the after-market stereo. Without the GWH-343, you would have to cut the OE radio plug and manually test each wire to connect to your after-market receiver.

In addition, because you do not have to cut your OE radio plug off, the GWH-343 allows you to reinstall your factory receiver if necessary. A great example is if you sold your car, but wanted to keep your after-market radio and re-install your factory stereo receiver. We also recommend the Scosche BOBAZT for a quick connection that is sure to last.

Product Features:
  • Plugs into car harness at radio
  • Power/4-Speaker
  • 21-Pin plug
  • Used for Installing an Aftermarket Receiver to factory plug
  • Allows for the installation of an aftermarket radio using the existing factory wiring and connectors
  • No need to cut or splice in factory wiring
  • Compatible with select 1988-2002 GM Vehicles
  • Metra Equivalent: Metra 70-1858 and Scosche Equivalent: Scosche GM02B
  • Yellow – 12V Constant
  • Red – 12V Accessory
  • Black - Ground
  • Orange – Dash Light Dimmer/Illumination
  • Green – Left Rear Speaker (+)
  • Green with Black Stripe Left Rear Speaker (-)
  • White – Left Front Speaker (+)
  • White with Black Stripe – Left Front Speaker (-)
  • Purple – Right Rear Speaker (+)
  • Purple with Black Stripe – Right Rear Speaker (-)
  • Gray – Right Front Speaker (+)
  • Gray with Black Stripe – Right Front Speaker (-)
Compatible with the following vehicles:
  • Buick:
    • 1988 - 1996 Century
    • 1988 - 1990 Electra
    • 1988 - 1994 LeSabre
    • 1988 - 1994 Regal
    • 1986 - 1995 Riviera
    • 1991 - 1994 Roadmaster
    • 1988 - 1989 Skyhawk
    • 1987 - 1995 Skylark
  • Cadillac:
    • 1988 - 1991 Deville
    • 1988 - 1991 El Dorado
    • 1999 - 2002 Escalade
    • 1988 - 1993 Fleetwood
    • 1988 - 1994 Sedan Deville
    • 1988 - 1991 Seville
  • Chevrolet:
    • 1991 - 2005 Astro
    • 1988 - 1997 Beretta
    • 1992 - 1994 Blazer
    • 1988 - 2002 1500, 2500, 3500 Full-Size Truck
    • 1990 - 2002 Camaro
    • 1991 - 1997 Caprice
    • 1991 - 1999 Cavalier
    • 1990 - 2002 Corvette
    • 1994 - 1996 Impala
    • 1997 - 2000 Malibu
    • 1995 - 1999 Monte Carlo
    • 1990 - 2002 S-10

Harness Features

Vehicle Sound System
This refers to what kind of sound system the vehicle has. Premium audio systems are generally name brand systems (such as JBL, Bose, Rockford Fosgate, etc) that have been installed inside a vehicle when it leaves the factory. Often they more advanced systems, complex wiring, factory amplifiers, and other features that can make installing aftermarket component difficult.
Standard Sound
Main Harness Function
Different installations on different vehicles require different harnesses. This type is what the harness is considered. Each wiring harness we sell serves a purpose such as installing an aftermarket car stereo, integrating an aftermarket amplifier with your factory car stereo, connecting Bluetooth to your factory car stereo, and more.
Connect/Install an Aftermarket Car Stereo
Additional Harness Features
The various features that the wiring harness provides to your car stereo and/or audio system.
Compatible Vehicle Make
Allows you to view only items that are compatible with your vehicle's make. Does not guarantee that it will work with your vehicle year or model.
Compatible Vehicle Make and Model
The model of vehicle that this vehicle specific product is designed for. Please keep in mind that engine variations can affect the compatibility of the products.


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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

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1 Star

Average Attribution Rating


Ocala, FL

Plugs into GM Radios 90+

May 20, 2005

Nice product, plugs right into your GM 21 Pin radio. I used this on Pontiac & GMC stereos 1997 and 1999 respectively. Works great. Wires clearly labelled.

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: American International GWH-343