I need wiring diagram ( FREE ) of 1979 GMC( 4x4) K1500 truck and one for a 1976 or 78 2wd. I am replacing the 79 body with the other one. Wiring is different.
I suggest you go to Autozone.com, and Become a Member. (Top right corner of home page)
[After you have joined, and signed in, go to the top left, and click on Manage My Vehicles.
On the next page go to the middle right, and click on Add a Vehicle, in the orange button.
Now click on the Year, Make, Model, and Engine.
On the next page that comes up, click on Vehicle Repair Guides, in the left hand column.
In the middle column click on Chassis Electrical, then on this page go to the bottom, and click on Wiring Diagrams]
I have seen all three years you listed, and the wiring diagrams for them. I refer people to this site only for free wiring diagrams, usually.
[Besides my experience, I also use my Mitchells shop manuals for solutions]
Problems are answered here on FixYa in a solution, and we have some excellent experts, in case you have questions about that wiring.
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