Buy a Haynes or a Chilton manual. They will have all the wiring daigrams that you will need.
autozone.com then go to repair manual link
need diagram for wiring for 1986 transam
I need the wiring diagram on a 1986 Chevy silver ado dual fuel tanks
location and wiring of the horn relay
Bikebandit.com
You can find a fuse panel diagram for a 1986 Ford Ranger XL in the owner's manual. You can also find it at select auto part stores.
Autozone
the only wiring diagram i have found on line for free so far is at autozone.com
A wiring diagram can be found as a print out from an automotive store. A person can also get it from the cars maintenance manual.
The Nissan shop manual has a complete wiring diagram, they can be found on e-bay.
Try MOTORLIT.COM yyou can get either a wiring diagram or owners manual which will have it.
Haynes manual