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