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Find Your Vehicle
1988-94 GM Wiring Harness

If you are shipping to AU, BE, BR, CH, CZ, DE, FR, GB, JP, NL, NO, NZ, RU, SE, or ZA use our Dealer Locator to find a dealer near you.
This harness prevents you from having to cut your vehicle's factory wiring harness when installing your RetroSound radio.
661 Wire Code Chart
Wire Color |
Function |
Red | +12 Volt Accessory |
Yellow | +12 Volt Constant |
Black | Ground |
Blue | Power Antenna/Amp Turn-On |
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 - |