Both my 2018 and 2014 2500 and 3500 trucks do not have trailer taillights or marker lights when hooked up. Reverse, brake and turn signals work properly on the trailer and the trucks taillights work as they should. I see no cut wires or blown fuses. Any help would be greatly appreciated.

 

Same trailer hooked to both trucks?? I would be thinking problem with trailer

 

Yes the trailer blew something in both trucks. But the fuses are not blown.

 

there is a dj build and a d2 build. Which year, engine and size for each truck?
what fuses did you check? be specific.
Have you confirmed no power at the truck trailer park lights pin in the 7 pin connector?