Possible alternator and or voltage regulator issues?

Hey everyone. Ok so the 71 demon has been done for a couple years now and yesterday i started her up and immediately noticed a problem. First ill tell you my setup 340 with electronic ignition upgrade mopar voltage regulator and distributor and coil. Cant remember the size of the alt but its not a high output alternator but still using the ammeter guage in car and have replaced the fuse able link wire to a fuse type fuse able link. Ok so when i started her up immediately the ammeter guage went to +40 or all the way to the right and my interior lights were really bright well then it poped the 30 amp fuse in the fuse type fuse able link so i shut her off replaced the fuse and then fired her back up and it didnt pop it again but the ammeter guage was fluctuating between 0 and +40 so i shut her off and havent messed with it yet die to being sick but i want to know where is a good place to start looking or checking to track the problem down any help would be great thanks