just wondering why the speakers will shut off all but one on the driver side door. when i hooked the amp up i ran the ground and power wire, the car already had a stock jbl amp in it and the stock cd player doesn't have adapters to run the remote so we spiced it in the stock amp and ran the speakers from the back speakers, it worked for like 20 seconds and than all speakers go out except for one of them, any suggestions on what to do differently?