Metra® 70-1856 - Aftermarket Radio Wiring Harness with OEM Plug and Amplifier Bypass

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Product Details


Aftermarket Radio Wiring Harness by Metra®, with OEM Plug and Amplifier Bypass. For aftermarket stereo. Metra preassembled wiring harnesses can make your car stereo installation seamless, or at least a lot simpler. With precrimped ends and prepopulated connectors, your wiring task will be highly simplified. These harness connectors will mate with your components exactly like the OEM connectors.



  • Mates the aftermarket stereo with car wiring harness
  • Allow seamless integration of custom stereo with vehicle
  • Secure connection to existing connectors avoids splicing
  • Pin-to-pin compatibility
  • Color-coded wires
  • Includes antenna extension
  • 21-pin plug
  • For non-Bose systems only
  • Allows for the installation of an aftermarket radio using the existing factory wiring and connectors
  • No cutting of factory wiring needed
  • Tuner Bypass
  • 204 inches long


  • 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 (-)

Installing a custom stereo into a modern car can be a nightmare. Make your life easier by using a custom prewired harness from Metra. With preassembled connectors that mate with OEM connectors on the vehicle or your aftermarket electronics, making proper pinout is a breeze. Minimize hand crimps and splicing, especially in the cramped spaces inside the instrument panel or under the dash. Color-coded wires are easy to trace, making for fewer mistakes.

For more than 60 years, Metra® has been at the cutting edge of innovation providing premium products that are both easy to use and easy on the eye. The brand's extensive product line includes dash kits, wiring harnesses, speaker harnesses, speaker adapters, antennas and more designed to exceed the strictest customer expectations. With many years of experience and manufacturing expertise, the company leads the way in its commitment to create stereo installation accessories that offer excellent fit and unrivaled performance. Utilizing only advanced technologies and the latest equipment, Metra ensures that the quality of everything it makes is second to none.

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Warranty Information

Metra warrants that its Products will be free from defects in material and workmanship for 1 Year from the date of purchase by the Original Purchaser. This warranty does not apply to any Products that have been subjected to misuse, mishandling, misapplication, neglect (including but not limited to improper maintenance), improper installation, or alterations.

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

Vehicle Fitment

1996 Cadillac Fleetwood 
1996 Chevy Corvette 
1995 Cadillac Deville
  • Concours
1995 Cadillac Eldorado
  • Will Fit Model with Console Shift.
1995 Cadillac Fleetwood 
1995 Cadillac Seville
  • Will Fit Model with Console Shift.
1995 Chevy Corvette 
1994 Cadillac Deville
  • Concours
1994 Cadillac Eldorado
  • Will Fit Model with Console Shift.
1994 Cadillac Fleetwood 
1994 Cadillac Seville
  • Will Fit Model with Console Shift.
1994 Chevy Corvette 
1993 Cadillac Eldorado
  • Will Fit Model with Console Shift.
1993 Cadillac Fleetwood 
1993 Cadillac Seville
  • Will Fit Model with Console Shift.
1993 Chevy Corvette 
1992 Cadillac Brougham 
1992 Cadillac Eldorado
  • Will Fit Model with Console Shift.
1992 Cadillac Seville
  • Will Fit Model with Console Shift.
1992 Chevy Corvette 
1991 Cadillac Brougham 
1991 Chevy Corvette 
1990 Cadillac Brougham 
1990 Chevy Corvette 

All manufacturer names, symbols, and descriptions, used in our images and text are used solely for identification purposes only.
It is neither inferred nor implied that any item sold by is a product authorized by or in any way connected with any vehicle manufacturers displayed on this page.