Yes I had this whine in my system as well in my Tahoe. The way I got rid of it was purchasing a Heavy Duty noise supressor from Radio Shack. It is a 20A suppressor and all it needs is the positive leads passed through it and it worked like a charm. The noise is from the alternator and yes you could most likely solve it by running grounds all the way to your battery but for my installation in a Tahoe that was not very practical.
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[This message has been edited by Tekati (edited 11-01-2000).]