1993 GMC Yukon Electrical Short: I Need a Wiring Diagram I need a wiring diagram to figure out a short without having to tear apart all the wiring harneses. This short is affecting the gagues fuse on the top left of the fuse block (20 Amp). I have isolated it to a pink/black wire going into the firewall harness. After that I have no clue. Gmc Wiring Harness Diagram | Free Wiring Diagram Variety of gmc wiring harness diagram. A wiring diagram is a streamlined traditional photographic representation of an electric circuit. It reveals the elements of the circuit as streamlined forms, as well as the power and also signal connections between the gadgets. GMC - Car PDF Manual, Wiring Diagram & Fault Codes DTC GMC Car Manuals PDF & Wiring Diagrams above the page - Canyon, Jimmy, Sonoma, Terrain, Acadia, Safari, Envoy, Suburban; General Motors Cars EWDs; GMC Engine Fault Codes DTC. Is synonymous with high-class trucks and SUVs GMC brand has been around for about 100 years. GMC name came with the creation of "Rapid Motor Vehicle Company" in 1901.