Condition Price Qty  
Very Good $14.00
This is the original wiring diagram printed by GMC for dealer mechanics. You can follow the wiring in your truck for the specific optional equipment in the title. This covers only the differences for vehicles with the Allison transmission. For wiring that is common to trucks with other transmissions, this diagram will refer you to the main diagram. It will help you to understand connector configurations, and locate & identify circuits, relays, and grounds. Although the schematic is in black and white, the color of each wire is noted. You will not find this diagram in your shop manual, nor will you find it in the main diagram for your truck. The diagram pictured is an example of this type when folded, but is not the actual diagram for your vehicle. Buy now for the best electrical repair info - the factory wiring diagram.
"Footnotes -For Misc. R.P.O. Equipment - Engine Wiring With Allison Transmission T-7793 T-7794"
This item is original.
8.50 x 11.00 x 0.05 inches
MD7793 1971
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This book covers all 1971 medium duty GMC conventional truck models SE5500, CM5500 & CM6500.
1971 GMC Series 4500-6500
1971 GMC Series 4500-6500