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What you are describing is a symptom of a ground loop. A ground loop occurs when there is a difference in potential between ground points. The most likely culprit in this case is your amplifier's ground. Ideally, all electronics would ground to the same point, thereby eliminating any possibility of a difference in potential, but this just is not possible. Since the majority of the electronics in the car ground to the frame, the best possible location to ground the amplifier is also going to directly to the frame, or as close to it as possible. Seat bolts, bracket bolts, etc., anything that will make solid, metal-to-metal contact as close to the frame as possible is going to be a good ground. You also need to ensure the ground point is clean and clear of any resistance. You will want to grind away any paint, remove any insulation, padding, dirt, carpet, etc., from the ground location so that the amplifier's ground makes as much contact as possible with as little resistance as possible.
I hope this helps.
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True knowledge exists in knowing that you know nothing. True wisdom comes to each of us when we realize how little we understand about life, ourselves, and the world around us.
-Socrates
Last edited by UV7; 05-02-2007 at 12:43 PM.
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