Hey guys, here's the problem. I have a '99 mustang with premium sound, but not the mach 460 system. Anyways, I had pioneer speakers replaced all the way around complete with two 12 inch subs. I also have a Pioneer head unit. Some idiot broke into my car(I don't know how they got in) and stole my Pioneer head unit, and now I can't get my stereo to work right. I replaced the head unit with a Sony and now my sound doesn't work????? Does anyone have any ideas on what I should do to get it to work? Thanks alot!!!

 

did you have an amp installed? make sure your using the correct wires when your hooking everything back up. make sure none of the wires broke loose from the connectors or anything also.

 

connect the blue wires. You probably have not bypassed the factory amps and need to turn them on.