Hate to start another thread ... but.. help !

I had a problem similar to this with my dart when I first got it, at idle voltage would drop way down but then pick up at higher RPM's. If you have any #8 or #10 wire hanging around that's long enough run a piece from the alternator directly to the battery positive. Might help with your problem, fixed mine as the voltage was dropping as it ran through the bulk head connecter, to the ammeter and back out to the battery.