Hello,I need some help from the electrical guys on this site. I'm using this site instead of the B body forum because I know there are some really smart guys here. The car is a 64 Sport fury. It has a 440,and I converted it from the old style alternator and regulator to the square back alt and flat style reg. I have msd ignition,with no ballast resistor. There is no radio or electric fuel pumps or fans
What's happening is when I did the conversion it worked great. Then I came across a chrome alt that was supposed to be rebuilt and it worked great for a while,then it started to not charge (less than 12 volts) at under 1000 rpm. Above that it worked fine. So I took it to an alternator shop and he said the diodes were bad,and fixed them as well as press on a billet pulley from my March kit. Put it on and it worked ok for awhile then it would do the same thing,not charging at less than 1000 rpm. So I took apart the good (not chrome) alt. and put the stator and the diodes into the chrome alt and it worked fine again, charging at 750 rpm. now it's doing the same thing again.Not charging at less than 1000 rpm.drops to 10v with heater and high beams on. So, why does it keep doing this,is there an armature issue? I tried a new reg today and it's the same. Help?