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Message: <blockquote data-quote="Slo_Ride" data-source="post: 8777043" data-attributes="member: 563830"><p>99.9% of the time this is caused by a ground loop. You may have the battery grounded to the frame, the headunit grounded to the dash and the amp grounded to the body. I'm not saying that is the exact case but that's what causes a ground loop. What you want to do is connect all of these grounds. That doesn't mean they have to all have the exact same grounding location but running an extra ground wire to the body usually solves the problem. Sometimes even a grounding strap from the body to frame can fix the problem. There are also head units that have grounding issues. You didn't mention what car, what head unit, or anything. Soo.....</p></blockquote><p></p>