I have a 2003 dodge intrepid and I am having some trouble with my amp and subwoofer. I have a Kenwood sub and amp. I had my sub hooked up in my trunk and unplugged it to bring it inside because of the cold. I plugged it back in today and the sub isn't working. My amp has power, both the fuses are good and not blown, and all of the wires going into the amp are tight. Why wouldn't my sub be working with everything hooked up right?