your radio may have a amp signal wire on it already, read your HU manual for that. if not, i used a add a fuse to the wiper fuse for the amp signal wire. if the signal wire's power stays on with the key off, the amp will stay on all the time. and kill your battery.

that being said, some amps need a different signal sent to them to turn on. a simple 12 volt line wont turn some on.


and yes, it sounds like you got it all figured out now.