Arcing from the metal part of the plug to the block? WTF?
This is just me guessing but is it possible the voltage regulator has anything to do with it? Are the voltage regulators inside the alt? If so check the alt, I'm just trying to help not sure if it has anything to do with it.
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1985 Mazda RX7 GSL 13B, Holley etc
1997 Mazda MX6 LS - DD lowered on 17s
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