I have a 2006 dodge ram 1500. My left turn signal and brake light on my trailer wiring quit working. Is there a fuse for this wire and where is it located

I don't believe that there are seperate fuses for the left and right turn sigs, The trailer lighting depends very heavily on the white grounding wire near the trailer ball hook-up. Check with a test light at the red and yellow wires while someone else flips the switch from left to right if you get power then check back at the left lamp assy. If you have no power there try grounding that assy. base with a big flathead screwdriver if it works then, you need to change out the left assy.Alsocheck and make sure your left turn lights are working on the main vehicle if not try a new flasher, I've seen this all the time where the flasher weakens and will not operate on one side but will on the other. One last thing, The brown wire is for the running lights only. Have someone stand at the rear of the trailer and, with the running lights on use the left and right turn sigs and step on the brake. If ANY of the other bulbs come on weakly at any time or cross back and forth by them selves you've got to rerun the main ground wire to the trailer. Good luck. Dana