I purchased this amp http://www.crutchfield.com/p_777M407....html?tp=35782, and this sub http://www.crutchfield.com/p_777B12/...h=b12&skipvs=T from Crutchfield and the amp is overheating and going into thermal protect mode.
I did some tests using a volt meter and at the battery I get 14.23 volts, with the volume turned up and the system jamming I get about 13.60 volts at the amp. I thought maybe that it was a bad ground but since there isn't a significant voltage drop I dont think thats it. I have the rear channel bridged to the sub and a pair of alpine 6x9's running off of the front channel. The amp only gets hot on the side where the sub is connected. I have 8 gauge power and ground wires and 14 gauge speaker wire going from the amp to the sub. I have not upgraded any of the stock electrical system ground wires or alternator wires.
Where in the trunk is a good place for a ground? I just peeled up the carpet in the back, sanded a small space and used a self tapping screw. I'm not 100% confident in the ground so I'm going to relocate it anyway.