When I fitted my stereo I had real bad interfearance.
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Alternator was one and Power steering pump was the other.
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Here is what I did to sort it out it took me ages trying many different things but these are the things that worked;
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I mounted my amp on teh firewall behind the drivers seat.
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originally I had teh power to teh amp and te phono leads going down the centre channel, big mistake.
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Routed teh phonos behing the trim under teh treering wheel and then down the driver door footwell.
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This made the power steering whine better but did not get rid of it.
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I earthed the amp to the body of the car, there the engine lid release is, first removing all paint rust etc so uit was metal to metal.
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This virtually stopped all the power steering noise.
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i can still hear it if teh car is not moving and im moving the steering wheel and Im specifically listeneing for it.
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The alternator noise was harder to get rid of.
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Turned out to be where i had put the crossover for teh passenger speakers.
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This was picking up interfearance from wiring in the passenger footwell.
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Moved teh corssover into teh glove box and roberts your fathers brother.
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All in all about 7 days worth of work.
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I sorted it out eventually by finding a really helpfu guide on a website;
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Do the following tests.
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1) Remove the RCA leads from your amplifier.
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If yuo still have the problem cahnces are its at the amp side.
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if not try changing the head unit ground or grounding yoru RCA leads, easy to do wind some wire roung the male part of the RCA connector before you plug it in and then attac the other end of the wire to the head unit ground
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- apparently this helps with Pioneer systems especially.
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2) If the noise is present with your head unit disconnected from your amplifier, remove each speaker in turn to find out the troublesome one.
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I originally though i had a problem with all of them do to the fullness of sound from the feedback, turned out to be just from teh front passanger speakers.
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3)Once you have iosolated problem speakers, try to find out why, ie exposed connections, crossovers to close to wireing that sort of thing.
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Only use isolators as a last possible resourt as they just mask the problem not cure it.
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PM me if you want any more advice, like I say speant absolutely ages on this before I got it right and went down many wrong paths and happy to share any knowledge or experience with anybody to stop them making the same errors i did.
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Andy