PM me I have a copy of a wiring diagram I can send you.
When I got my truck it was a butchered mess. I ended up buying a couple from the wreckers and spending one day with all 3 harnesses spread out on my lawn and and making one good one from the 3 harnesses all with the right color coded wires.
Many Econo owners have used the Painless Wiring or the Centech Wiring harness to completely redo the wiring. If your wires have become brittle after being in there for 50 years, it might be best to rip it all out and start with one of these kits. Of course our vehicles are a little odd since the engine is not in front, so some wires have to be lengthened.
It has been noted that the Centech kit is better then the Painless kit.
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