IM TRYING TO INSTALL A AFTER MARKET STEREO IN MY SLS BECAUSE THE FACTORY SYSTEM WAS STOLEN AND ALL IS LEFT ARE THE BARE WIRES, I TRIED TO HOOK UP THE NEW STEREO, BUT ALL I COULD GET IT TO DO WAS LIGHT UP, IT WOULDNT MAKE ANY SOUND, I CALLED AROUND TO THE AUDIO STORES, AND THEY SAID SOMETHING...