2003 GMC C-Series MK3 Engine Compartment Fuse Box Diagram 2003 GMC C-Series MK3 Engine Compartment Fuse Box Map Fuse Panel Layout Diagram Parts: Powertrain Control Valve, Ignition, Starter, Horn, Ignition, Power Take-Off, Neutral Start, Rear Defog, Powertrain Control Module, Engine, Air Conditioning Compressor, Anti-Lock Brake System, Engine, Electronic/Automatic Pump, Horn, Powertrain Control Valve, LG5 Electronic Control …