2001 Chevrolet Silverado 1500 | Stereo Wiring Diagram 2001 Chevrolet Silverado 1500. March 31st, 2012 Posted in Chevrolet Silverado. 2001 Chevrolet Silverado 1500 Stereo Wiring Information. Radio Battery Constant 12v+ Wire: Orange. Radio Accessory Switched 12v+ Wire: Yellow. Radio Ground Wire: Black. Radio Illumination Wire: Gray. Stereo Dimmer Wire: Brown. What are the wire colors for a 2001 Silverado radio? The 2001 Toyota stereo wiring uses five different colors. The red wire will be for the positive wire. The black wire is the ground wire. The stereo speaker wires are yellow and green.