Alternator hot

['82 steppin]

I found out this new problem in my '82 shortbed stepside after starting the engine the alternator gets really hot that cant be touched I toke off the positive terminal in the back of the alt. and it runs much hotter I cant remember if I had this problem before I put electric fans and MSD full ignition the car runs perfect the engine cranks easily I just put new battery the voltmeter runs above 13 and drops to lets say 12s when I turn on the lights
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