Okay I need some help! I have a 2007 Dodge nitro slt with the infinity audio system. I am attempting to put a new aftermarket stereo in it. I want to keep the factory amp. (I have installed many previously) I am getting power to the unit but the amp doesn't seem to be turning on. Tried different methods and nothing works. I have the correct harness (not the cheap one) canbus one or something like that. Everything is wired correctly but I'm still getting nothing. Any ideas?