2004 Chevy Radio Wiring Diagram - 2004 Chrysler PT Cruiser Main Control Fuse Box Diagram. 2004 Chrysler PT Cruiser Main Control Fuse Box Map. Fuse Panel Layout Diagram Parts: A/C compressor, diode, A/C compressor clutch, brake lamps switch, controller anti lock brake, horn relay, high horn note, cargo lamp, overhead console module, ignition switch, power outlet, starter motor relay, ignition switch, controller anti lock brake. Hello -- 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..