Original 1990 GMC & Chevy Trucks Dealer Electrical Wiring Diagram Service Manual. This very informative Factory Manual covers Top Kick, Kodiak Medium Duty Truck Models. These detailed Wiring Diagrams are what the Dealership used to diagnose and repair your GMC. It also includes the Diesel Supplement which is loose pages added in front of Manual. Very useful and rare since they were not offered to the public. X-9041
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