Not really a diagram, but a list of the colors for the stereo. Hope it helps.
http://www.autotoys.info/forum/showthread.php?t=1998
It is important to have a diagram of the wiring system in a car. The wiring diagram for a 1979 GMC Jimmy can be found it is maintenance manual.
wiring diagram for GMC 2500?
Where can you find a diagram for wiring a stereo in a 2004 GMC Sierra online?Where can you find a diagram for wiring a stereo in a 2004 GMC Sierra online?
Do you need the body wiring diagram, the Federal engine control wiring diagram, or the California engine control wiring diagram for a 1985 S-15 Jimmy 4X4?? What size engine does your GMC have? I would be happy to scan my Chilton's diagrams and email them to you. Reply to coulomb4000.com and I will scan what you need and send it via email.. Put "GMC wiring diagram" in the subject line, so I know what is about.. I am working on my 1986 GMC S-15 Jimmy 4X4 and have 2 manuals to work from. That is how I found this question.. Dave
You can find a steering column. Diagram, for a 1989 GMC Jimmy, at most GMC dealerships. You can also find the diagram at most auto-parts stores.
You can find a radio wiring diagram for a 1993 GMC Sonoma in the vehicle's owner's manual. You can also find it at local auto parts stores.
See if your public library has a Chilton's Handbook with the diagram. Ask a reference librarian to help.
A wiring diagram for a 1990 GMC 2500 4x4 can be found in the car's owner's manual. You can also find wiring diagrams at auto part stores.
You can get a wiring diagram for electric windows on a GMC Vandura 2500 in the owner's manual. You can also find it at various auto stores.
Walmart
When making changes to an electrical or wiring system, a diagram is important to have on hand. A wiring diagram for this car can be found in its manual or an auto tech at an auto part store, or shop may print one out.
Try AutoZone.com under repair.