Yesterday I was simply moving my amp to a hidden location in my 350z. The only wire I actually relocated was the amp ground to a different hole. Before yesterday I never had any problem what soever. When I first hooked everything back up the amp ground wasnt good and as soon as I turned the car on the subwoofer would go off by itself to no particular beat. I took the ground out shaved down the spot and reconnected it and that was gone. Now as soon as I turn my car on or even just the key, whether the radio is on or off the subwoofer lets out a very low hum and as soon as I turn the car off it