i have a 2004 mach 1 mustang with the mach 460 sound system. i bought an after market head unit and the metra 70-5521 wiring harness. after removing the stock head-unit, i spliced the obvious wires together on the rectangular harness (green-green, green black-green black and so on). the trouble im having is with the remote wires. there is one from the headunit wiring, one on the rectangular harness and 2 on the smaller harness with the rca's. i am completely stumped on how to wire these all remote wires together and still have a normal remote out to connect to an aftermarket amp for the sub i plan to install. also to make it that much harder, i will be integrating a 5 volt regulator to eliminate start-up pop. so my question is, how do i wire the 4 remote wires and 5 volt regulator together AND have a remote out for another amp still (for a subwoofer)?