NHTSA Complaint #11569070 — 2022 FORD F-450 SD

Getting this message “Trailer Left TurnLamps Fault Check Lamps”. This is issue is intermittent but it causes the trailer lights, turn signal, stop light and warning lights on the left side to be very very dim and not visible. The lights would be good when trailer is hooked up but it will go dim and not work properly on the road. Those driving behind would not be able to see turn light while moving lanes and possibly causing an accident scenario. Gone to two different dealers and they cannot recreate the issue with their equipment. Called Ford twice to report the issue and concerns. The trailer has been checked by the dealer and showed no issues when hooked up to an independent battery. Have changed the fuse twice but they were not burned out so it was not a fuse issue. Apparently there are no current recalls for my VIN.