Alt whine all of a sudden

[TurdFergueson2 5,000+ posts]

I have a crunch Pzi 125.4 amp for my highs and all of a sudden i began getting alternator whine. I do have a pioneer HU (690ub) and i did try the wiring the rcas thing without success. The only think that i found to work was removing a set of rcas from the amp. Doing so just unhooks the tweets so it's not too bad. My question is could it very well be the amp itself? i haven't tried isolators or changing the ground or anything like that. I removed my 3-4 channel RCAs and no more noise. I am using streetwires zero noise rcas (go figure). Everything was fine up until i changed my alt and battery. I am pretty sure that this may have had anything to do with it, but who knows?

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