Unless your stock head unit had an amplifier hooked to it the head unit would not have a remote wire.What you can do is run a wire from your fuse panels empty accessory on slot and it will turn your amp on when your car turns on.You can also put a switch on that wire to turn the amp on and off as you please.You can also do it another way,run a wire from your amps power input to your passenger compartment and put a switch that is easily accessible from your driver's seat and then send the line back into the remote input of your amp.Done!