Thank you...I had the same problem alot of us have or have had . To many bubas over the years. I had wires going no where & a wireing harness over 1" thick going across the firewall. Lasy yr I had a small electrical fire in the engine compartment due to old insulation on the wires & who knows what. So I did a temp fix to get it to my shop. I decided to rewire the engine compartment, but when I saw further I ripped out all the wiring in the car ordered a Ron Francis kit . Then proceeded to rewire the complete car. Haven't had a problem since.
You can solve your problem, but it will take some time. Check al the grounds first.
ground wire from battery to frame under battery
ground wire from frame frt passenger side to engine
ground wire to starter
From there you'll have to trace each wire & I suspect you'll find some going nowhere.
I would open up all the harnesses in the engine & go wire by wire. This way you can check fro bad insulation also.
disconnect your battery first.
If you know how to read an ohm meter it will make things much easier. At least this is a start. But from what you describe I'd inspect all the wiring under the hood to start.
Alan
______________
