The accessory wire that you are looking for is the one that tells the head unit to turn on when you turn the key in car. If you have an aftermarket deck then the deck has it's own for the amp usually it is blue and in your case may not be connected to anything. If you don't have an aftermarket deck you will need to find a wiring diagram for the car radio harrness and it will be labeled. You dont want to use any random wire because if that wire always has power your amp will stay on and kill battery. You can wire a switch if you choose this method to prevent that from happening. You may also try running a wire from main power of amp to a small fuse (remote uses less than 2A) then to a switch and then back to remote screw of amp.
This website has wiring diagrams but colors dont always match. http://www.the12volt.com/ Good Luck
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