Original 1971 GMC Dealer Electrical Wiring Diagram Service Manual. This Manual was used by the Factory Dealership to diagnose and identify electrical problems on the Truck Models, 4500-6500 and 7500-9500. It contains a wealth of information and will prove invaluable in service procedures on this model. Good condition with some wear, staining and soiling from use in a Dealership [see photos]. X-7105
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