Did any of your Cents come with an amp and subwoofer? If so, where is it mounted?
When I bought the truck the front speakers were not working, so I checked the amp mounted in the rear pass side panel. Found the out the problem was a loose ground. I also noticed speaker leads for a subwoofer, it dead ended under the carpet at the tailgate. Just wondering if a subwoofer was an optional item or aftermarket.