go to your local auto parts store and buy a chiltons or a haynes manual for your vehicle. It is well worth the money! instead of trying to get free info on line, whichs takes forever in most cases. trust me I did it and love it, I still come back to the internet for performance upgrade questions but for the most part all the info you need on your vehicle is in that book.
www.installdr.comthey have wiring harness diagrams for all makes
i have the the full wiring diagram for the entire truck i can e mail you
any chevy workshop will have wiring diagram and will usually photocopy it for you try Autozones website
On older vehicles many forums host downloads for service repair manuals. To find a wiring diagram on a 1965 Chevy Pickup truck search on Chevrolet Classic truck forums.
Buy the repairing book of Haynes.. it has everything in..
Go to autozone.com. They have wiring harness diagrams for free download for most vehicles. If found all wiring diagrams for my 88 Silverado.
When working on anything electrical it is important to have a diagram for safety reasons. The wiring diagram for a 1995 Toyota pickup radio can be found in the maintenance manual.