Hey Charlie, thanks for the reply. So obviously corrosion in the Body ECU isn't a good thing and there was certainly plenty of it... ironically though, there was no signs of corrosion on the actual circuit board within the Body ECU, it was all throughout the "triple layered junction circuits". I don't know what to call it but its three layers sandwiched together. It doesn't contain relays or capacitors but only metal strips that route signals/voltage/current around... I cleaned all corrosion, soldered a couple new pins in place of some that had broken or corroded apart, and generously coated all the layers with dielectric grease before re-assembling the unit.

Regardless, today i went to the junkyard and got a new (used) Body ECU. Once plugged in, the truck experienced the exact same issues from before. So at this point im almost certain i have a grounding issue. Not sure where but somewhere. The headlight switch is supposed to be grounded somewhere...

Tomorrow im gonna trace from the Body ECU to the stalk/switch and see if i can provide a ground there. I read another thread with identical problems and the solution was something to do with the instrument panel. I couldn't make sense of that thread tonight but i will begin there again tomorrow.

Looking for some excellent wiring diagrams of the headlight switch to Body ECU tonight