2008 F 350 diesel 4WD

Trailer Running lights out at plug and wire to plug.
Have checked fuse 63 under hood OK and relay 55 good. Not sure if those are related to trailer RUNNING lights. Frustrated over nomenclature from plug to fuse panel that I cannot find anything specific to trailer RUNNING lights. Have checked all fuses under hood good.

Anyone have some advice on exactly what fuse (s) relay (s) to check.

Thank You in advance

 

Do you have another fuse panel at the left side of the dash next to the steering column?

 

No. Interior panel is on pass side below dash.

 

heater does not blow warm air

 

Are you the original owner of this vehicle? Asked this just in case someone else installed wiring. If we knew this ,,,would help.