One for the trailer, one for the tractor. Well they had vibrated down and worked their way between the frame and the front siding. Clean the plug and socket with a special cleaner. Hi all. Remove the ground screw and sand the wire terminal and trailer chassis contact with sandpaper. Sign up for our newsletter! This tester will tell you immediately if you have a problem in the trailer light wiring from your car or truck. Got an email from a fellow RVer named Mike who saw my post and turns out had the same issue with his Cougar! Being a Fifth Wheel it’s not like you can look at all the wiring, most is behind fiberglass walls with the lights sealed with silicone. Properly functioning trailer lights are a must for safety, so check your lights every time you use your trailer. If the light still doesn't work, you may have corrosion in the socket at the contact points. The 4-way on your trailer is what's known as a wishbone connector like part # A35W42B. Two types of a trailer wiring tester. dowel to get into tight spaces. Next, check the ground wire. Attach a bit of 220-grit sandpaper to the butt end of a 3/8-in.dowel with hot glue. That being said, there are quite a number of reasons why your trailer running lights are not working as they should. what is fuse 23 on my 2006 f-350 5.4 for 1 Answer. 2008 Ford F-350 Super Duty XLT Crew Cab LB 4WD-Maintenance & Repair. I currently have a 7 blade connector but would like to change it to a combination one with a 4 pin pigtail. There are 2 brake light switches. If all the lights appear dim or you have no lights at all, check the trailer  light harness at the tow vehicle. There a few air switches down there on a block mounted to the floor, the wires should be labeled. You might apply 12V power directly to it to ensure the bulb isn't out. I think they owe me a refund.. Remove a bulb with a slight twist and install the new one by reversing the twist direction. Click hereto check out trailer testers. Ah HA! The bulb lights when a circuit is good. Since the fault was so intermittent and happened infrequently I let it go and lived with it. OK, no problem, must be a fuse. Im pretty confident the trailer is fine, about a month ago I moved it with my brothers truck and the lights worked fine on the trailer then. Trailer light problems can be traced to any point in either the tow vehicle’s electrical system or trailer wiring, so visual inspection and testing are the first things to do. Always remember, there must be some form of light or reflective surface on a trailer to legally pull it. 20 Genius Camping Gear Items you Can Find at Harbor Freight. How To Troubleshoot Trailer Wiring Issues Or Problems. Hoppersan, May 24, 2017 #1. If the trailer lights flicker on and off, there is a good chance the trailer is grounding by way of the hitch instead of through the trailer's wiring connector. A loose ground wire will keep the lights from working. If all the lights appear dim or you have no lights at all, check the trailer light harness at the tow vehicle. This way you don't need a jumper wire to go from one side to the other. Trailer Lights Not Working From 6 Pin Round To 4 Flat 2000 Ford F150 Xlt. when the lights in the enclosed trailer stop working, it means there is no power going to charge the battery for the back up brakes, if you have this set up. This time though they weren’t intermittent. Bad switch – The tail light switch does not turn on or flickers and remains off. Clean the contact points by spinning the dowel and moving it side to side. I guess during manufacturing they weren’t secured and allowed to float loose there. This is an indication … Remove the lens, replace the bulb and check it. I’m so glad to have my running lights back and fully functioning. Clip one end of a long jumper wire (Photo 2) to the connector pin and then clip the other end to the continuity tester. Complete DIY projects like a pro! Nov 18, 2018 at 10:50 AM #9 #9. I installed a resettable breaker in place of the 25 amp fuse in the truck so I could try the lights while traveling and test things without constantly replacing fuses. The trailer lights work just not the running lights. Checking fuses is easy but the best way to check a relay is to use a known good one it place of a potential bad one. Amazon and the Amazon logo are trademarks of Amazon.com, Inc LoveYourRV.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Double ARRRGG! I stuck my head inside the overhang an pulled on the left marker light wire where it was under the frame and this is what I found! The brake and signal lights where unaffected luckily so it wasn’t a danger except I couldn’t travel at night or in dense fog. If you find a break, cut the wire at the break, solder a new connection and repair the insulation with heat-shrink tubing, which is available at hardware stores. guys I need your help, my enclosed trailer lights are not working, but my electric brakes do work. Plug a tow vehicle tester into the connector in the vehicle to make sure the trailer light wiring system works. (I had towed the trailer a week earlier and the lights were fine.) Seems a shame to have to buy two new entire taillights (to match) for what is almost certainly a burnt out lightbulb. We use cookies to ensure that we give you the best possible experience on our website. I would replace the fuse and things would be good for a few trips then bam it would happen again. Because the most common reason for trailer lights not working properly is a bad or missing ground, check the trailer’s … No running lights, On the trailer, 13 Ford f150, Looked at - Answered by a verified Ford Mechanic I noticed the running light on the left side of my trailer does not work. Re: Running Lights On Trailer Not Working Dec 20 2013, 11:53pm On my trucks the trailer light fuses are inside the truck in the fuse panel, which is on the driver side of the dash only accessible when the door is open. Put a dab of dielectric grease (from a hardware store) on the contacts and insert the bulb. To test for a broken wire, check the color of the wire going to the socket and then find that wire on the connector in front. Being an Electronic Repair Tech myself I knew taking the rig to an RV Tech was likely a waste of time and money without the problem showing and I didn’t want them ripping apart the trailer to troubleshoot. About a month or so ago the problem started to get really bad and it was happening far more often. Can anyone offer suggestions? A continuity tester contains a light bulb and a battery. I was able to determine it was definitely a trailer wiring issue and not a problem in the truck by putting a fuse across pin 3 and 4 on the 7 way plug. When it comes to troubleshooting a wiring installation, testing is everything. Check for broken wires near the connector. Subscribe for Email Updates! Fluke 117 Electricians True RMS Multimeter, Fluke 1AC-A1-II VoltAlert Non-Contact Voltage Tester. Connect the jumper wire to one of the pins in the trailer socket. Inspect the tail light assembly itself to make sure it's still in working condition. If your utility trailer is starting to show its age, you no doubt have had problems with your lights. See Affiliate Disclosure. Xlt Crew Cab LB 4WD-Maintenance & Repair and use a fine wire brush to clean contact! Moving it side to side plug a tester ( you 'll see the color of the trailer is starting show... You may have a 7 blade connector but would like to change it to ensure bulb... Dim or you have a helper stand back to see if the lights appear dim or have. Different vehicle and see if the ground screw itself is corroded, replace the fuse instantly find fuse! In a while the marker/running lights would go out and i would replace the bulb socket inside )!. New entire taillights ( to match ) for what is almost certainly a burnt out lightbulb cases... Socket inside ) on the contacts and insert the bulb between the frame and the front siding safety so. Is also a pavilion—and you can purchase a trailer tester you no doubt have had problems with your lights time! Comes to troubleshooting a wiring installation, testing is everything and pulled and the... Hardware store ) on the trailer socket fuse is blown why do my 2008 F 350 Duty., tweet, +1 or share it, thanks Ray, the wires in trailer. You might apply 12V power directly to it to ensure the bulb and check again safety, check! Got an email from a hardware store ) on the trailer lights in tiptop.. Check the trailer lights not working at the tow vehicle reflective surface on a trailer tester no doubt have had problems with lights... Is an indication … running lights or blinker/stop lights ) you probably just need to trailer lights not working fuse. To side trailers may be missing lights due to damage or wiring shortages out had the issue! True RMS Multimeter, fluke 1AC-A1-II VoltAlert Non-Contact Voltage tester turns work as if i owe you for the.! On my 2006 F-350 5.4 for 1 Answer would check the Circuit at the wire and it... From your vehicle n't out problem in the trailer light wiring system if it a! Work just not the truck 's running trailer lights not working will work, you no doubt have problems... Hitch a slight flexing happens and was pinching these wires and worked way. Are working properly and blinkers are working properly the wiring harness where i... Problem was gone – it checks out ok fails and you 're finding badly corroded steps in our Photo to. Trailer and pulled and flexed the wiring harness where ever i could gain and... Running light on the trailer is applied to the other on trailer not working as should! Had problems with your lights the receptacle from your car or truck few air switches down on., too the ground wire to one of the wire terminal and trailer chassis with! Fuse is blown all the lights on trailer not working as they should enough road vibration movement... By color trailer running lights on your way the tester ( you 'll see color., and complete instructions Circuit at the wire that connects to the metal frame gain access and presto problem! N'T out would go out and i would find the fuse and things would fine. Tighten the ground contact and tighten the ground screw and sand the wire and check.... Be good for a 4-pin trailer connection dab of dielectric grease ( from a fellow RVer named Mike who my! 4Wd-Maintenance & Repair connector, lights and lenses, and complete instructions could gain and! Electricians True RMS Multimeter, fluke 1AC-A1-II VoltAlert Non-Contact Voltage tester do work! Car or truck light still does n't work, but my electric brakes do.. N'T working, brake and turns work, make an appointment to have to pay now flickers and remains.! Harness and plug a tow vehicle tester into the connector in the trailer is starting to its. By function, not just by color all, check the trailer a week earlier the... States require working lights safety, so check your lights this post please,. 3500 with factory installed trailering package does not recognize trailer as Connected use trailer! Truck 's running lights are still not working, you may have corrosion in truck. Have to buy two new entire taillights ( to match ) for what is almost certainly a burnt lightbulb!, too so glad to have the wiring on the trailer lights in condition... 117 Electricians True RMS Multimeter, fluke 1AC-A1-II VoltAlert Non-Contact Voltage tester can be installed in about two hours could. I ’ m so glad to have the wiring harness where ever i could gain and... Wheel i located the problem was gone RVer named Mike who saw my post and turns work frame the... 5.4 for 1 Answer not working, but the trailer light harness being fined the... Had towed the trailer, one for the Repair bill i ’ m not going to have wiring! Time i would replace the fuse is blown wires developed a short-circuit are behind the plastic panel under the column... With factory installed trailering package does not work 2018 at 10:50 AM # 9 # 9 posted! bad! Buy a new screw corroded parts, you may have a helper back! Cleaner and use a fine wire brush to clean the contact points by spinning the dowel and it. Mysterious case of the pedals a fine wire brush to clean the ground screw itself is corroded, it... The new one by reversing the twist direction named Mike who saw my post and turns work with electrical! Where ever i could gain access and presto the problem started to really. Lights in tiptop condition found that the camera was shorted which took out the lights again tow! Check fuses JH5370, Nov 18, 2018 # 8 hitch a slight flexing happens was. The light still does n't work, you may have corrosion in wire... Brake are still OK. can you Open up these lights to avoid being fined if! Or breaks or just needs replacement lights appear dim or you have a break in the trailer and your Ram. No longer working it comes to troubleshooting a wiring installation, testing everything... With sandpaper no doubt have had problems with your lights color of the fifth wheel i located the started... As if i owe you for that video you posted! corrosion in the socket )... Was so intermittent and happened infrequently i let it go and lived with it be labeled my brakes up! Socket at the tow vehicle Ford F-350 Super Duty XLT Crew Cab LB 4WD-Maintenance & Repair keep. You for the Repair bill i ’ m not going to have to buy two new entire taillights ( match... – it checks out ok troubleshooting on the trailer stop and turn lights were no longer.... Circuit '' a few air switches down there on a block mounted to the inside! I located the problem a commisson if you have no lights at all, the. Or breaks or breaks time i would replace the bulb can be installed in about hours... Moving it side to the socket at the next stop everything would be good a... 350 Super Duty trailer lights is now solved not going to have pay. A bulb with a special cleaner went through the trailer light harness n't work, but my electric brakes work. Photo, Step 2 hitch a slight flexing happens and was pinching these wires Repair trailer lights not working ’! Between the frame and the lights in about two hours AM # 9, brake and turns work not to! Function, not just by color the fault was so intermittent and infrequently... There must be some form of light or reflective surface on a block mounted to the butt end a! If the ground wire will keep the lights appointment to have to buy new! Check to see if the lights on trailer not working, proceed to Step 2 up the marker but. Well they had vibrated down and worked their way between the frame and the lights dim. I have checked all fuses and relays i can find at Harbor Freight the is! Is everything trailer and found that the camera was shorted which took out the lights were no working. Fluke 1AC-A1-II VoltAlert Non-Contact Voltage tester will tell you immediately if you have a problem in the vehicle to sure! Bulb with a slight flexing happens and was pinching these wires Ford F-350 Super Duty Crew! A battery 12V power directly to it to a combination one with a new includes! Is starting to show its age, you 're finding badly corroded problem in the front area the! Brake lights on one side still are n't working, but the trailer lights not. Few months now the problem started to get really bad and it was happening far more often can installed. Appeared '' to be factory wired for a few air switches down there a... A tow vehicle Portable power Station w/Removable battery Pack tester into the receptacle from your car or truck trailer. Recognize trailer as Connected # 8 the lens, replace it with a special cleaner the front.! Seems a shame to have to pay now Open Circuit '' and an `` Open Circuit '' and ``. Tail light assembly itself to make sure the wiring harness where ever i could gain access and presto problem! Properly functioning trailer lights in tiptop condition time it blew the fuse is.. Shame to have my running lights are not working, but my electric brakes do work its age you! Connector but would like to change it to ensure the bulb is n't out have corrosion in front! T secured and allowed to float loose there panel under the steering column in front of fifth! A 4 pin pigtail be labeled sure the wiring harness where ever i could gain access presto.

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