I don't know of an online wiring diagram, but I have a copy of the 1974 GM Pontiac Service Manual and it has the foldout wiring diagrams in the back. Probably worthwhile investment if you have a significant redo on the car wiring. You can usually find a used copy on ebay for about $30.
Also, you can buy a nice color coded 11" x 17" laminated wiring diagram from Ames Performance. Part # M100AL - $16.00. El Monte slim posted this part from Ames a few years ago.
Good luck.
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