curtis84ta

althought its not a 3rd gen...my bros neon has my old 200M fostgate amp powering my old 12'' Mtx 6000. it worked fine until a couple days ago...hes using the speaker channels for the inputs instead of rca's. and has it connected through a 2nd fog light switch (looks stock) and as soon as he turns onthe sub theres a continous rumble...as soon as he turns it off it shuts off....my first guess would be a ground somewhere between the switch and amp. but beyond that i would be clueless....so if anyone knows or has experienced a constant rumble (besides our engines) and might have an idea on what it could be...any help would be greatly appreciated.

NEEDAZ

Try disconnecting the speaker inputs. How is the amp grounded?