You need to tap into the ignition wire going to your head unit...whether it aftermarket or OEM. They BOTH have ignition wires( this is so it comes on with the car). DO NOT go straight from the battery that is GHETTO

:. You only want your amp on when the stereo is on. The yellow wire going to your head unit should be the ignition wire...the red is constant power for memory.
As your attorney, if you're using the factory head unit, I would advise you to get a line out convertor if you have not already done so. About 10-15 bones. I'm assuming you have since you are trying to hook up your remote wire.
This is the only way to do this. All others including going to the fuse box are not advised.
