1988-94 GM Wiring Harness
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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 - |
