Original 1991 GMC Dealer Electrical Wiring Diagram Service Manual. This very informative Factory Manual covers Top kick, Kodiak and Medium Duty Truck, C5H, C6H, C7H and S7 Models. These detailed Wiring Diagrams are what the Dealership used to diagnose and repair your GMC. Very useful and rare since they were not offered to the public. X-9141 Good condition with normal wear and soiling from use in a Dealership [see photos].
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