Truck is a 06 exhd 379 has a c15 in it. I cannot get power to the head unit for the air conditioner. it all works I put power to through another circuit on accident and everything fired right up and worked. Every fuse is correct and not blown I literally checked and replaced every fuse even installed fuses in all the spares. The relays behind the gauges has power on one side but not the other. And this is where the lights that run under cab get their power from but nothing power wise on that side.