I do not want to sound negative, i just want to say my meaning in this. I think the stock alternators are nothing else but real
J U N K. I have been thrue 3 of them and two regulators the last 4 seasons. Lot's of problems with no charging, everything between 10Volts to 13-14 Volts... not enough to ignition, running stereo, electric fan etc... Now i run with a 70 Amp BOSCH with internal regulator. No more problems! Constant 14,5 Volts if i remember correct... This i recommend you guys that can live with the fact that you will not have a stock alternator, or stock factory look. But they are solid and you can thrust them, & they WILL work! Much more realiable!
No affence to the rest of you that feel you have no problems with standard chrysler alternators. I hope you don't mind.. This is my oppinion only!
Btw, maybe you could test another regulator, see what happens?
(From my experience, i think that the volts can seem to be ok when you meassure, but the amps can play you around a bit when the alternators are done. This will get you very confused, it looks like you have volts enough but still not. When these alternators, regulators are done they ARE done, not realible at all... It is like they can have enough volts without any load, but when you are getting in to use some lights etc, out on some charge on the battery, then there is not enough, the alternator is to weak, very, very confusing and irritating)
The ammeter will act like this even without any short, i guess you do not have any short (hope not) "could be" but, if the alternator or/and regulator start to get weak enough, it cannot stand any load, and will act like this. And you will itch your head because you think that it doesn't seem to make sence at all. I guess your alt./reg. is broken. that's it!