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While disassembling my voltage regulator to replace it I found what looks like Apollo 1 and smells like the best materials that the EPA banned decades ago. It looks like the fire? originated at the #5 terminal and made everything else nice & crispy. This alternator still works pumping out 33.2 volts and I'm crossing my fingers that the new voltage regulator will get it working properly. The 1/8" pipe plug was missing from the top of the alternator and I think it's been overcharging since I bought the truck 3 years ago.