Toad tail lights not working

Working on a 2004 Fleetwood Discovery 39L with 2016 Ford Explorer toad. Tail lights on the toad not working. The problem appears to be no voltage at the tail/running lights pin on the Motorhome. Brake and turn signals work fine. Does anyone know where the tail light connection on the trailer hitch connects? Haven’t been able to find a schematic.
Also the rear roof running lights do not work. Related? All other lights on the MH and toad are good.
Any suggestions will be appreciated.
Stan