I would check you local libriary for a repair manual.Actually autozone.com has all you need in the my zone section, just register and have access to any info you want. manuals, diagrams etc.
http://wiki.answers.com/Q/Where_can_you_find_the_wiring_diagram_for_a_1982_ford_e3501982 ford e350
your local ford dealership
My 1991 E350 Fuse diagram is in the owners manual.
goto: www.installdoctor.com on internet
No the wiring isn't the same
The 1988 Ford Thunderbird fuel sending unit wiring diagram can be obtained from most Ford dealerships. The wiring diagram can also be found at most auto-parts stores.
Either in the back of a Haynes or Chilton manual or, best of all, in the authorized Ford wiring diagram from Helm. I have found them on Ebay and swap meets.
A diagram for a 1994 Ford e350 can be found in the trucks service manual. The manual can be found through most auto parts.
The Ford Courier wiring diagram can be obtained from most Ford dealerships. The wiring diagram can also be found at most auto-parts stores.
A diagram of the wiring systems in a car can be used as a guide. A wiring diagram for the 1983 Ford can be found in its maintenance manual.