no trailer brakes or lights

[rickey woodlee]

2019 chevy hd3500 some times I have trailer breaks and lights and turn signals and warnings flash took to dealer and they said it was my trailer I have hooked my trailer to two other hd and no problems they were 2011 tested prongs on bumper plug no voltage to left turn light or running light no elect. break voltage 

[Shall36]

There are a couple threads on this. There’s a module at the rear of the truck that can have intermittent connectivity.