Basic4 pin ecu wired per diagram. Truck cranks and fires just fine but will die when letting off the key. Typically symptoms of urnt ballast or loss of run power but... The ballast is not open ckt and bypassing the ballast keeps it running.
I'm thinking the coil is some sort of high resistance unit for ignition system that don't use a ballast. Considering the other hacks on this truck it wouldn't surprise me.
So I'm looking for specs to confirm.