What voltage is the switch? If it's a 12v switch it's not going to work without using a relay. A remote turn on feed from the head unit wont supply enough voltage to light up the switch. A 12v lighted switch usually has one terminal connected to ground, one connected to 12v, and the third (usually the middle) terminal would be the output. Flipping the switch would close the circuit sending 12v to light up the switch, and also sending power to the output wire. Sending 12 volts through the remote on wire would roach your amp quickly. It's possible to do what you want, but more advanced wiring is necessary and difficult to explain here. Maybe someone else can chime in here and help.