Factory Radio Wiring

[nyckreyna]

I am installing a system and am about done but i cant seem to find the switch wire on the factory wiring. That will turn my amp off when i switch the truck off. I thought it was the blue wire but that was wrong. Does anyone have and idea of which wire it is or know were i can get a factory wiring diagram to a 2008 gmc sierra 1500 4x4 i believe its also called the remote wire

[Stevenduchnych]

i am guessing you are adding a amp to a stock stereo ? there is no remote wire on factory harness you have to tap in to a switched line or get a line out converter which hooks up to your speaker wire and will turn on when it senses output.