Changing the bulb with one that is known to work did not solve the problem. 2015 f-450 trailer running lights were not working only turn, brake and emergency lights, after checking a few fuses found #26 blown on main box, replaced it and everything is back to normal again. Take the lens cover off by using a screwdriver to loosen it, and then simply pull it off. If this is a popup and the lights are in the roof section the problem is probably the connector between the roof wiring and the trailer body. Get a 12v test light and work your way back. I would double check all connections from the front marker light on the right side back to the right rear taillight. The common causes the tail lights do not work are; Blow fuse – The first thing the mechanics check is the fuse corresponding to the rear lights. Right Tail Light of Trailer not working... Jan 27 2013, 4:55pm. Anyhow I have wondered ever since I first plugged in my boat trailer, why the running lights (tail lights) are always On, all the time as soon as the plug is inserted. Ranging from “How-To” videos, pictures and illustrations of various components, systems and features to fully searchable content and downloadable PDFs for individual component owner’s manuals, answers are always just a click away. Hi, I have a pop up camper. Swapped out a couple of the lights with ones that are working - not the lights. Since the tail and side lights seem to be working the problem is inside the trailer. 4 people found this helpful. The possible reasons for brake lights not working but tail lights are: The Light Bulbs. The tail light on the right side of my slide in camper works, but the brake light and turn signal do not work. Remove the screws from the bulb lens (which you can access through the trunk or see your vehicle repair manual to get the exact location). A more common case scenario presupposes ground to be provided through the bolts of the tail light assembly. Not a bad job all in all, the vehicle had only 12000 miles on when I purchased. All of the nonfunctioning lights are in the front of the trailer. When the fuse is blown it does not allow the circuit to complete. Ground is achieved in one of two ways. Yes I've replaced both tail lights and a side light I can get the left turn signal to work but not the right. Make sure you are careful in laying the cover down and away from the site you are working … Checked all switches, fuses, breakers which are all good. Mechanic's Assistant: Have you checked the bulbs? A 12vdc test light is a great troubleshooting tool on trailers. I'm getting 6 volts of power on my ohm meter and 8 volts when I push the brakes, and yet the bulb does not light up. I'm thinking a wire nut or connection has vibrated loose. Purchasing a bulb that does not fit the type of vehicle you have only causes the lights to either not work at all or work for a bit, but soon burn out. Mechanic's Assistant: What year is your Quest? Blown out light bulbs are the most common reason for why the brake lights not working but the tail lights are. I also notice my outside light by the hitch doesn't work either. Have you checked the connection? In the first case, separate wires come out of each tail light assembly and are attached to a metal frame. All the flashers and brake lights function ok. Fuses and relays all good. Make sure that each of tail lights is properly grounded. Sounds like everything on the truck is working fine. All lights on the truck are functioning. The tail lights work, but the brake lights and turn signals don't. Trailer tail lights not working? Well I'm trying to get the tail lights and break lights to work on my jayco quest pop up camper. What is going on. 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