I recently installed a older kenwood hu with a single 10" subwoofer and 1400 watt amp in my 07 G5 base and now when I use turn signals, pw windows/locks or hit the brake pedal I can hear it feed back through the sub. All grounds for entire system are either hooked to the negative of battery or chassis ground from battery. I've tried different rca's along with rerouting them and still same effect. I'm wondering if anybody else has ran into this. The only thing I haven't done is moved the 12v constant for hu from harness to constant power elsewhere. Any help would be appreciated.