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My best suggestion is go down to the local auto parts store and get a Haynes manual #36058 for the Ford Pick-ups & Bronco 1980 thru 1996
It don't have any diesel engine info, but it does have wiring diagrams in the back.
They don't show you where they run, but it does have the wire colors listed.
You have a lot of hacked wires on both sides of the engine.
I can only imagine what it looks like under the dash, I saw wires hanging in the glowplug switch picture.
o to dave i got vids for my truck up on youtube go to user kuklok1989 and u get a video of my truck it might help expain all the prolbem it has at once