Radio wiring : Electrical Manuals - Silverado Sierra May 29, 2012Hello -- I replaced factory radio in a 2002 Silverado with aftermarket unit (the factory radio connector had been removed). The wiring harness includes three dark green wires (solid green, no stripe): one is 12V+ (switched by ignition), one is for a speaker, but I'm not sure what the third one is for. Related searches for 99 silverado radio wiring diagrams chevy silverado radio wiring diagramchevy radio wiring diagramwiring diagram for chevy silverado2009 silverado wiring diagram2011 chevy silverado wiring diagramwiring diagram 2003 chevy silveradofree chevrolet silverado wiring diagram2004 silverado wiring diagram pdf