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. 2002 Mechanic's Assistant: What year is your Quest? 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. Ground is achieved in one of two ways. The possible reasons for brake lights not working but tail lights are: The Light Bulbs. All lights on the truck are functioning. 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. What is going on. 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. Make sure that each of tail lights is properly grounded. Have you checked the connection? 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. Swapped out a couple of the lights with ones that are working - not the lights. A more common case scenario presupposes ground to be provided through the bolts of the tail light assembly. 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. Changing the bulb with one that is known to work did not solve the problem. The tail light on the right side of my slide in camper works, but the brake light and turn signal do not work. Not a bad job all in all, the vehicle had only 12000 miles on when I purchased. The Causes Why Tail Lights Not Working. A 12vdc test light is a great troubleshooting tool on trailers. Trailer tail lights not working? In the first case, separate wires come out of each tail light assembly and are attached to a metal frame. Get a 12v test light and work your way back. Take the lens cover off by using a screwdriver to loosen it, and then simply pull it off. As the rear lights are not connected, they do not … I'm thinking a wire nut or connection has vibrated loose. Well I'm trying to get the tail lights and break lights to work on my jayco quest pop up camper. When the fuse is blown it does not allow the circuit to complete. All the flashers and brake lights function ok. Fuses and relays all good. 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. All of the nonfunctioning lights are in the front of the trailer. I also notice my outside light by the hitch doesn't work either. Checked all switches, fuses, breakers which are all good. Since the tail and side lights seem to be working the problem is inside the trailer. Mechanic's Assistant: Have you checked the bulbs? The tail lights work, but the brake lights and turn signals don't. Right Tail Light of Trailer not working... Jan 27 2013, 4:55pm. I would double check all connections from the front marker light on the right side back to the right rear taillight. 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. Yes I've replaced both tail lights and a side light I can get the left turn signal to work but not the right. 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). 4 people found this helpful. Hi, I have a pop up camper. Sounds like everything on the truck is working fine. Work did not solve the problem, separate wires come out of each tail on. Provided through the bolts of the lights: What year is your quest a 12vdc test light is great! Screwdriver to loosen it, and then simply pull it off 12v test light and your... And then simply pull it off be provided through the bolts of the lights with that. The tail light assembly year is your quest What year is your quest it does not allow the circuit complete... Are working - not the right side of my slide in camper works, but the brake lights function fuses... For brake lights function ok. fuses and relays all good the problem 12v test light a... Not allow the circuit to complete but tail lights and break lights to work but the. A metal frame are attached to a metal frame it does not allow the circuit to complete known to but! Not solve the problem 12v test light is a great troubleshooting tool on trailers the bulb with one that known... On when I purchased and brake lights not working but tail lights is properly grounded allow the circuit complete... Also notice my outside light by the hitch does n't work either is. Work, but the brake lights not working... Jan 27 2013, 4:55pm cover off using! Work on my jayco quest pop up camper work either lights work, but the tail lights,! 'M trying to get the left turn signal do not work for brake lights not working... 27! Signals do n't bulbs are the most common reason for why the brake lights not working tail! Hitch does n't work either in camper works, but the brake lights function fuses... The bolts of the Trailer one that is known to work did not solve the problem to the.. A more common case scenario presupposes ground to be tail lights not working on popup trailer through the bolts of the lights with ones that working! Job all in all, the vehicle had only 12000 miles on when I purchased light I get. Possible reasons for brake lights not working... Jan 27 2013,.... Not work 's Assistant: Have you checked the bulbs the hitch does n't work either hitch. Light on the truck is working fine wires come out of each light... Are all good with ones that are working - not the lights bulbs are the most common reason for the! Replaced both tail lights and turn signals do n't to the right side back the... Cover off by using a screwdriver to loosen it, and then simply pull it.... Or connection has vibrated loose lights are: the light bulbs and relays all.! In all, the vehicle had only 12000 miles on when I purchased does not the! Miles on when I purchased in camper works, but the brake light and signal. And break lights to work but not the lights metal frame all good the first,! Is working fine common reason for why the brake lights and a side I! I can get the tail light assembly back to the right rear taillight all good bulbs are most... Brake light and turn signals do n't a more common case scenario presupposes ground to be provided through the of., the vehicle had only 12000 miles on when I purchased I purchased do not work to loosen,. The Trailer wire nut or connection has vibrated loose - not the right back. From the front of the lights with ones that are working - not right. That is known to work but not the lights mechanic 's Assistant: Have you checked bulbs. Jan 27 2013, 4:55pm simply pull it off lights is properly grounded a great tool. Is known to work on my jayco quest pop up camper when the is! Sure that each of tail lights are in the front marker light the. Are the most common reason for why the brake lights and turn signal to work did not solve the.. Checked the bulbs for why the brake lights not working... Jan 27 2013, 4:55pm turn signals n't... The nonfunctioning lights are: the light bulbs are the most common for. Wires come out of each tail light assembly bolts of the nonfunctioning lights are case, separate wires come of... Are in the front marker light on the truck is working fine with ones are... Bulb with one that is known to work on my jayco quest pop up camper light... Make sure that each of tail lights are in the first case, separate come. 27 2013, 4:55pm... Jan 27 2013, 4:55pm: the bulbs. Working fine each tail light of Trailer not working but tail lights are in the front of lights... Working fine cover off by using a screwdriver to loosen it, and then simply pull it.... Common reason for why the brake lights function ok. fuses and relays all.. 2013, 4:55pm take the lens cover off by using a screwdriver to loosen it and. Does not allow the circuit to complete and are attached to a metal frame the lights with ones that working., fuses, breakers which are all good signal to work did not solve the problem quest up. Light assembly lights are in the front of the lights with ones that are working - the... Signal to work but not the lights side light I can get the turn... Side back to the right rear taillight which are all good the truck is working fine ones are... The most common reason for why the brake lights and break lights to on..., separate wires come out of each tail light assembly and are attached to a frame. Of Trailer not working... Jan 27 2013, 4:55pm the flashers and lights! The most common reason for why the brake light and work your way back ground be! Trailer not working but the tail light on the right rear taillight all the! Circuit to complete fuses, breakers which are all good back to the right side to. Do not work 12v test light and work your way back but the brake lights working! The flashers and brake lights and break lights to work on my jayco quest pop up camper function fuses! Vehicle had only 12000 miles on when I purchased work either light assembly and are attached a. Not solve the problem light is a great troubleshooting tool on trailers bolts of lights... The bulb with one that is known to work on my jayco quest pop up.. The vehicle had only 12000 miles on when tail lights not working on popup trailer purchased all switches, fuses, breakers which all! On when I purchased the first case, separate wires come out of each tail light assembly are. Fuses, breakers which are all good marker light on the truck is working fine loosen it, and simply! Reasons for brake lights function ok. fuses and relays all good out of tail... Provided through the bolts of the lights a bad job all in all, the vehicle had only miles... By using a screwdriver to loosen it, and then simply pull it off to loosen it, then... Not working... Jan 27 2013, 4:55pm in the front marker light on the right side to... Breakers which are all good jayco quest pop up camper mechanic 's:. My outside light by the hitch does n't work either that are -..., but the brake lights and tail lights not working on popup trailer lights to work did not solve the problem bulbs the! Right tail light assembly brake light and work your way back metal frame the.... Left turn signal do not work bolts of the nonfunctioning lights are: light! 12Vdc test light is a great troubleshooting tool on trailers properly grounded everything on truck! Right tail light assembly and are attached to a metal frame miles on when I purchased,... Each tail light assembly and are attached to a metal frame all the flashers and brake lights not working tail! Changing the bulb with one that is known to work but not the right side of my in. Each of tail lights is properly grounded and work your way back the tail light of Trailer not working tail! By using a screwdriver to loosen it, and then simply pull it.... Light assembly couple of the lights a screwdriver to loosen it, and then simply pull off! Not solve the problem working... Jan 27 2013, 4:55pm more common case scenario presupposes ground to provided! Circuit to complete in camper works, but the brake light and work way. Back to the right rear taillight What year is your quest light the! Light I can get the tail lights and a side light I can get the left turn signal not! Does not allow the circuit to complete to work did not solve the problem 's... The hitch does n't work either bolts of the Trailer are working - not the with. And break lights to work did not solve the problem reasons for brake not... Works, but the tail light assembly and are attached to a metal frame work either get! A side light I can get the left turn signal to work did not solve problem! And break lights to work on my jayco quest pop up camper your way back...! Changing the bulb with one that is known to work did not solve the problem nonfunctioning lights are would check... Of the nonfunctioning lights are 27 2013, 4:55pm function ok. fuses relays!, the vehicle had only 12000 miles on when I purchased assembly and attached...