Hi, I have a pop up camper. The tail lights work, but the brake lights and turn signals don't. 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. I would double check all connections from the front marker light on the right side back to the right rear taillight. Right Tail Light of Trailer not working... Jan 27 2013, 4:55pm. Checked all switches, fuses, breakers which are all good. 4 people found this helpful. Yes I've replaced both tail lights and a side light I can get the left turn signal to work but not the right. Not a bad job all in all, the vehicle had only 12000 miles on when I purchased. What is going on. Make sure that each of tail lights is properly grounded. 2002 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). Ground is achieved in one of two ways. Swapped out a couple of the lights with ones that are working - not the lights. Well I'm trying to get the tail lights and break lights to work on my jayco quest pop up camper. Trailer tail lights not working? Sounds like everything on the truck is working fine. All lights on the truck are functioning. Have you checked the connection? The tail light on the right side of my slide in camper works, but the brake light and turn signal do not work. All of the nonfunctioning lights are in the front of the trailer. 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. Changing the bulb with one that is known to work did not solve the problem. 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. All the flashers and brake lights function ok. Fuses and relays all good. A more common case scenario presupposes ground to be provided through the bolts of the tail light assembly. Make sure you are careful in laying the cover down and away from the site you are working … Blown out light bulbs are the most common reason for why the brake lights not working but the tail lights are. Get a 12v test light and work your way back. Since the tail and side lights seem to be working the problem is inside the trailer. 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. The possible reasons for brake lights not working but tail lights are: The Light Bulbs. 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. A 12vdc test light is a great troubleshooting tool on trailers. As the rear lights are not connected, they do not … In the first case, separate wires come out of each tail light assembly and are attached to a metal frame. I also notice my outside light by the hitch doesn't work either. I'm thinking a wire nut or connection has vibrated loose. 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. The Causes Why Tail Lights Not Working. When the fuse is blown it does not allow the circuit to complete. 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. Mechanic's Assistant: What year is your Quest? Mechanic's Assistant: Have you checked the bulbs? 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