1 way to do this would be... Connect the power to the battery run it in by the pedals through the trim into the boot. You have got a few options for the remote wire 1.connect to the head unit so when the stereo is off the amp is off 2.connect the remote wire straight from the power on your amp terminal to the remote making a small loop(please note the amp will always be on unless you put in a switch on your dash to control this) 3.Connect the remote wire to the battery when running the power cable to the amp, when you get just past the pedals run the remote wire to some where in the dash and put in a small rocker switch or switch of your choice, thus controlling the amp this way. Also as Muff said I would do this as common practice anyway but run the rca leads down the opposite side of the car or you will get humming and interferance, maybe even the rev noise through your speakers from the engine....