amp from oem head unit

How do you go about running am amp off of a factory head unit for the RCA's and remote wires? thanks

you want a line output convertor, turns the high level speaker signal into a low level rca signal that you send to the amps. As for the remote output, if your headunit doesn't have one you can always just connect to the switched ignition power. Your amp won't turn on and off with the headunit, but it'll turn off with the car.

most of the better line output converters (LOCs) have a wire for amp turn on built in to them