Hmm, 'hevy duty' alternators sound like they could have much lower output Z than
normal, and/or switching mode field coil drive. I think that a low pass filter
will have to be used to cure it. But if the noise is conducted then this may not
be enough. It is easily possible that the 'heavy duty' alternator installation
does something not quite ok with the grounding and that it is not your circuit
that needs changes. That may also make it impossible to duplicate.

Peter P.



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