good repair/electrical manual for old burban?

I have an '82 burban that i'd love a factory repair manual for. I've done some searching, and aside from one auction on ebay i shouldn't have let go - can't find one. My truck's electrical is a DISASTER, so electrical diagrams etc would be a huge benefit.

I have a haynes manual, and it has some good diagrams.

The factory manuals from Helm Publications are the best you can get, but can be expensive if you buy them online from Helm and they are not always available. Best bet is to watch for what you want on Ebay-it will enentually come up.