My crunch 3500w is going into protect mode when i turn up my radio. I have a 2008 impala with bose.. i installed a LOC to stock radio, connected power and ground to the stock amp. ran both speaker wires from LOC to correct sides of rear 2 speakers.. I grounded the amp by the spare tire on bare metal body right under the carpet when you lift it to get to the spare... REM to rap fuse in kick panel on paasenger side floorboard.... positive to battery..