About 2-3 months ago my 91 Caprice was stolen. It was only gone for about a week before I tracked it down and recovered it, but by the time I got to it, it had been striped. I have put a great deal of money into gettin it back in shape(New front bumper, Radiator, door Panels, Grill, Bonneville Seats, Pioneer Radio, 6X9s, Steering Column, Etc...)and now I,m ready to start my sound system but the driver side door speaker wont play it just squeels and i cant turn the volume past level 13 because all the other speakers will stop creating sound. I work at a car dealership so i asked one of the techs. what does he think the problem could be. He told me it was a bad ground wire so i fixed it but the speakr still wont play. Any thought as to what my problem may be?