bad connections make sparks, and make heat
fix yo grounds son!
also make sure the plastic alternator grommet isn't cracked/broken. it's the little piece of plastic that separates the charge stud from the alternator housing (which is grounded to your motor by all the bracketry etc.) jiggle your charge wire.
and i concur with add more grounds. from the battery to the chassis and chassis to motor.
Dave =]
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 RB25 280z GT30/76R 441hp/381tq 11.9@125
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