Whoever wrote "In a manual"...please! that isn't an answer.
First, you can get some wiring information from the Fuse Panel, located under the hood on the drivers side.
Second, the Chilton's user manual in Chapter 12 is ok.
Last, and probably best is http://www.wirediagram.com/gmc.htm
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?
ECOUSTICS.COM
You can order a wiring diagram from the dealer, I believe it is about $50- $60, there is no beter wiring diagram than a factory diagram
Try AutoZone.com under repair.
http://www.suzukiinfo.com/sierra/ It has all the manuals and wiring diagrams
Check modifiedlife.com, they have free wiring diagrams.
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i need a diagram on the wiring system for a 2005 f350 king ranch. where can i find one?
at alldatadiy.com you will have to pay but they are available
When changing the wiring of any part of a car, a diagram will help make sure the wires are placed correctly. The wiring diagram to the taillights of a 2005 Toyota Tacoma can be found in its maintenance manual.
autozone.com or local library
Here is a link to a PDF - below.