RockawayBob

So I have a perfectly working trailer and all its lights, I plug into my 2018 2500WT and only the marker lights work. No blinkers, No Brake lights. Tried cleaning the pins on both truck and trailer, same. Checked ground at truck plug, OK. Checked pin out voltage with the Flashers on...nothing? I have heard of earlier models having issues with the Tail Light Circuit Board, my truck lights work normally? Any ideas of where to start? Thanks RockawayBob