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Hi I'm trying to trace down the root cause of alternator whine / rpm dependent noise in our 996 with PCM (1), and aftermarket amp & crossovers. I've already improved the grounding on the amp (some improvement in whine) and next on my list is the head unit. Can anyone provide the "correct" grounding of the PCM head unit? Other suggestions would also be appreciated. Thanks! PS - newbie member, sorry if this has already been discussed, my search didn't turn up anything addressing this specific problem.