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