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On my original regulator, there was a capacitor? installed on the battery terminal. We put it back on since it was on the original, but is it necessary, does it help, can it hurt? See picture. Anyone have any info on this or have one on their vehicle?
Generator systems can, ah, generate a lot of RFI, (radio frequency interference) a nice loud high pitched whine that varies with RPM through speakers.
They would still be necessary if you want radio, but vintage capacitors are prone to shorting out or leaking voltage to ground. Depending where and how they are wired I'd think a bad one might cause problems.
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