Don't bother trying to reconnect your power- or your RCA leads. I've tried it all (head unit to loom/Battery, Amp (600W) to battery/chassis and all possible combinations) and had no success (Renault Safrane v6). I even connected the ground and possitive wiring with 10mm2 cabling and the problem still exists. So don't blame your Jeep for this, but blame Empeg. The only thing left to try is to isolate the wiring (power and rca) from as close as possible to (even in..) the Empeg. I wonder why Empeg isn't changing this design since so many customers are bothered with it. Buying expensive filters (estimated 100UK) and/or other technical appliances shouldn't be necessary. It should be in the head unit already. After all, it's not that you can get one with a Big Mac or a pack of cigarettes. My 'old' Sony radio/CD player performs great in the same setting, working on the same Amp. When problems persist, Empeg gets it's product back.