i've got a "83 ZX & i'm noticing Z's had a lot of electrical problems. So for now: does anyone know if a problem with the ECM can simulate a ground fault? & i tried to install a borsh hi-amp alternator but i had pole problems doing that.

The control units used in 1983 were not what you'd call an "ECM". They did no adjustments, calculations, etc. The were pretty much passive and simply patched signals through. Think analog vs. digital when comparing them to anything modern. Therefore, they wouldn't be able to 'simulate a ground fault'.

thanks i've got a professional mechanic trying to install that alternator now & we'll see what happens