Sounds like you have an intermittent dead short to ground somewhere in the hot side of the charging system, or maybe a complete loss of ground for the system and it was overcharging the battery and feeding high voltage and amps through the wiring searching for a ground.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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