***Update***
In my haste to leave for my camping trip I ruled out the tow vehicle. I decided to check again before I pulled the light out of the camper. It was a good thing I did.
There was no power to that light for stop/turn. It was a blown fuse under the hood of the truck for the trailer lighting. Apparently it has separate circuits for the truck and trailer.
Now that I think about it I did haul an old dump trailer the weekend before and dropped it off at my sons house. It must have blown the fuse.....
Thanks for your help anyway.
All is good now for the next camping trip.