The other thing that could cause this problem is there is a small supressor that is on the back of you alternator that has either come loose or has died. Very easy to replace and also very cheap. If you have an UHF or AM radio in the car then you will most likely have the same noise in that. The other option is that the sheild that is around any RCA cabeling and amps could be damaged and noise could enter through there. The electrics on carsalternator, distributer are great big noise generators. sheilding on cabeling between head unit and amp (ground) is the only thing that is protecting this.
Adam
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" In rivers and bad government the lightest things flow to the top" Johnny Cash
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