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I have a 2011 cab and chassis that the left hand turn signal and trailer turn signal has died. I have checked all the fuses and relays and can find nothing wrong but have no current to the back of the truck. The tail lights are working. The signals on the front of the truck and mirrors work. Has anyone had this problem or have a wiring diagram for these trucks before it drives me crazy.
There is a second fuse that feeds the 7/4 pin connections. In other words you'll have your turn signal on the truck but not on the trailer or to the connector. I just can't remember which fuse box it's in.
The problem turned out to be the body control module. I installed the new one yesterday but was not informed by the dealership that it had to be programmed. Was told to put the old one back in and bring it in and they would program it except now it won't start. It has a starting system fault. Anyone have any ideas how I can get it cranked.