Trying to get audio from a Kenwood aftermarket in a ‘06 Ram 2500 with the Infinity sound system. I used the interface they sold me with the harness, and the stereo turns on and all the functions work but no audio. I hooked the stereo to a spare speaker and it has output that way. The blue wire with a white stripe(amp turn on wire) has 12V and is connected. Basically out of ideas so any help is greatly appreciated!