I'm trying to find which is ACC and which is Constant on my harness, I'm trying to hook up my Pioneer 770MP, its wired up with ground (black) Yellow (ignition) and orange (Constant) but I'm still getting no power to the deck..

 

Did you check your fuses?

 

Yeah i actually took out interior light fuse before the install.. then right after posting i figured it out and it works perfectly

 

in any aftermarket harness, orange is your illumination. yellow would be your constant.

if you are splicing into the factory harness, disregard.