I'm having a problem with my sound system in my'89 GT. My car originally has the premium sound system.I bought a JVC headunit and some regular Pioneer speakers and bypassed all the factory wiring, I now have a new power , ground ,and speaker wire ran . It worked great for awhile(one year so far) but no It randomly won't have sound? The headunit has power and is playing the disc just no sound. Any ideas? I don't want to go ahead and re-do speaker wiring and such if there's something I should look for first.