I've searched everywhere, well it seems like it looking for a possible 12v switched at the radio harness for an aftermarket xm radio I am installing in my 2003 avalanche with Bose. I was wondering if the amp trigger can be used to turn the xm radio on at the turn of the key. I don't need it to stay on when the key is turned off. If that doesn't work if there is a switched wire somewhere near at the dash. Any help would be appreciated. I had someone install one in my 2006 Malibu maxx but I never looked to see how it was attached and probably a bit different than the avalanche.