I currently have my amplifier grounded to the seat bracket but not sure where to move it to. I heard that you could ground your secondary battery from the main battery, but can I use this same concept to ground my amp. I can't find a good spot to ground my amp unless I drill a hole through my floor and ground to the bottom of the car. The car is a 92 Ford Mustang. I can hear the noise from the exhaust, I'm pretty sure its coming from that ground spot