Joined: Jun 2009
Location: Huntington Beach
my 2000 gt has the mach 460 system. no subs and the amp was located below where the cd player sits.
i wasn't getting any sound with my jvc head unit, then i realized that i needed to splice together the blue amp wire from the jvc (via wiring harness from autozone) to the mach 460 amp. everything then worked.
as for yours; not sure if you have the amp rack (in the back i guess) or the one amp where the old cd player sits. depending on that; u have to make sure all the amps (if more than one) are spliced to your wiring harness amp wire.
maybe there is another amp for the rear speakers or maybe your rear speakers are blown?
2000 Mustang GT Convertible - BBK CAI, Trick Flow 70mm Throttlebody/Plenum and Stack Racing Spacer, Accel Super COP's, Full Length SubFrame Connectors, Flowmaster SuperFlow 44's, 91 Octane Bama Tune, more to come...