General motors radio wire harnesses and wire colors chevroletchevy gmc oldsmobile pontiac buick cadillac and saturn.
Stock stereo is a cd player w auto speed controlled volume or whatever the technical term is and a cassette slave drive. One is 12v switched by ignition one is for a speaker but im not sure what the third one is for.
2002 Expedition Radio Wiring Diagram Wiring Diagram
2002 Chevy Silverado 1500 Stereo Wiring Diagram Wiring Diagram
