I bought a 65 F 100 in good shape but has a few problems. It used to have a big block in it, and the previous owner decided to put a 76 302 in it and did a hack job on some of the wiring, in the cab and under the hood. Where can I find wiring diagrams to help fix this?

 

the kid I bought my '64 from 'rewired the truck himself' too - all from the same spool of wire... honestly - every single wire in the truck was the same color and held together with household wire nuts (scary). I got a Painless kit and rewired the thing the right way - you might look into one of their kits to redo the the whole thing instead of patching the old harness here and there... everything is labeled very well and you and pull it off in a weekend of hard wrenching. It's nice not having to worry about it going into thermal meltdown!

 

Reprints of the wiring diagrams are sold by most of the truck parts vendors, probably also this site. They go for $6-8. I've also seen them on Ebay.