I was running fine for years, then I burnt out my 7 month old 140 amp powermaster alt. I put in a 140amp Tuff Stuff it lasts 20 hrs!! 3 Pep boys alternators just to get it running. Nothing changed in 2 years. I have dual 12" electric fans , electric water pump and MSD 6AL-2, along with the usual custom guages. when my fans are off i get 13.5 volts when the fans go on the voltage drops into the 11's. could I have worn out fan motors that are drawing so much power that theyre killing my alternators? there are no shorts in the car, I had everything checked.