so, the radio works, but the remote lead won't turn on the amp? you checked the fuses and they are good. check the amps to make sure their fuses aren't blown. if all of that is good, then it sounds like your remote wire is burnt out.
you can put a toggle switch from a switched power (like the red wire off the radio) to the remote wire running to the amp. just make sure you disconnect the remote wire from the radio to the amp before hooking it up to the new power wire.