Alternator failure or something else?

Thanks for all those replies. I just wanted to update: Problem Solved! I had problems with the new alternator I used being defective from the factory (thanks NAPA). I got another one and now my charging system problems are fixed!
 
damn, usually napa parts are pretty good. are you running any power hungry aftermarket equipment, or it it pretty much stock
 
damn, usually napa parts are pretty good. are you running any power hungry aftermarket equipment, or it it pretty much stock

Well..... I do have a 15 with a 1200 watt amp. I have a 2 farad cap however. I havent made any other high power modifications like electric fans. I drive mostly highway too, so the battery does not suffer from many short trips. If I can get NAPA to just give me my money back I will buy Motorcraft. Another note about NAPA the store I bought the NAPA brand alternator from is the only one that will warranty it. My more local NAPA store will not.
 

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