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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 8185477" data-attributes="member: 576029">the brakes (and other things) can add noise on the ground system, and that noise can be amplified when you have ungrounded signals (since the amp and vehicle share the same ground plane.if it is in all speakers but only when you use the "rear" RCA's, but not when you use the "front" RCA's then that points to an RCA with a broken internal lead, likely a broken connection to the shield.i use a 2-piece head shell RCA's so i can look at and repair connections. the cheaper molded RCA head shells are not repairable.</blockquote>

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