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1988-94 GM Wiring Harness
If you are shipping to AU, BR, CH, CZ, DE, FR, GB, JP, NL, NO, NZ, RU, SE, or ZA use our Dealer Locator to find a dealer near you.
Free Shippingacross the United States via US Mail
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 - |
