Original 1982 GMC Dealer Electrical Wiring Diagram Service Manual. This very informative Factory Manual covers Medium & Heavy Duty Truck 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. The cover and edges of pages have soiling and staining, but information is all legible and it will serve its purpose [see photos]. X-8239
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