When it comes to troubleshooting a wiring installation, testing is everything. Why Do My Brakes Lock Up When Trying to Stop? OK, no problem, must be a fuse. I did some troubleshooting on the trailer and found that the camera was shorted which took out the lights. If so, consider moving it to a screw of its own or at least move it … In most cases, it can be installed in about two hours. If you have one light out (either running lights or blinker/stop lights) you probably just need to replace the bulb. This time though they weren’t intermittent. Two of the wires are the running light circuit which is a little easier to install since you can run one down each side of the trailer. Check your vehicle's plug configuration. 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. If all the lights appear dim or you have no lights at all, check the trailer  light harness at the tow vehicle. Two types of a trailer wiring tester. Usually this lights up the marker lights but this time it blew the fuse instantly. Complete DIY projects like a pro! Well that was a weird one. Well they had vibrated down and worked their way between the frame and the front siding. A continuity tester contains a light bulb and a battery. Glad I was able to help out. If the ground attached to the trailer does not give you an adequate ground, you can run the wire up to the ground circuit on the trailer connector. There a few air switches down there on a block mounted to the floor, the wires should be labeled. Hook up your trailer and connect the trailer light harness. 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. Check the trailer wiring by running a continuity test by connecting a jumper wire to the connector pins and a continuity tester to the sockets. Same story on two separate trailers. Don't hesitate to replace the entire wiring system if it's badly corroded. 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. 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. We are no longer supporting IE (Internet Explorer) as we strive to provide site experiences for browsers that support new web standards and security practices. If your utility trailer is starting to show its age, you no doubt have had problems with your lights. Double ARRRGG! Probe inside the socket with the tester (you'll see the color of the wire that connects to the socket inside). If the light still doesn't work, you may have corrosion in the socket at the contact points. Yay! 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. Every time I would check the circuit at the next stop everything would be fine. Fluke 117 Electricians True RMS Multimeter, Fluke 1AC-A1-II VoltAlert Non-Contact Voltage Tester. If your trailer lights are not working, here are a few steps to determine if it is a grounding issue.http://www.blazer-international.com/ Remove the lens, replace the bulb and check it. Trailer Lights Not Working From 6 Pin Round To 4 Flat 2000 Ford F150 Xlt. The truck's running lights will work, but the trailer won't if the fuse is blown. 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! They fuse the trailer running lights seperate from the trucks, so if you have a bad connection or ground the connector out, it will blow the trailer running light fuse, but the truck will be fine. Have a helper stand back to see if the running lights, stoplights and blinkers are working properly. Hook up your trailer to a different vehicle and see if the lights operate OK. My '07 "appeared" to be factory wired for a 4-pin trailer connection. You might apply 12V power directly to it to ensure the bulb isn't out. I’m so glad to have my running lights back and fully functioning. My trailer lights are not working. what is fuse 23 on my 2006 f-350 5.4 for 1 Answer. There are 2 brake light switches. Ah HA! Fix Bad Boat And Utility Trailer Light Wiring. 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. The trailer lights work just not the running lights. My next step other than to repair the wire will be to the rv dealer who charged me $135 to diagnosis the problem and tell me I had a bad 7 way and replaced it. HIMCEN H740 Pro Portable Power Station w/Removable Battery Pack! About a month or so ago the problem started to get really bad and it was happening far more often. Since the fault was so intermittent and happened infrequently I let it go and lived with it. There is no addtional cost to you. About a month or so ago the problem started to get really bad and it was happening far more often. (I had towed the trailer a week earlier and the lights were fine.) I think they owe me a refund.. Since it's just the left side we can at least be pretty confident that the issue is on the trailer side (and not on the tow vehicle). Remove the ground screw and sand the wire terminal and trailer chassis contact with sandpaper. This way you don't need a jumper wire to go from one side to the other. 20 Genius Camping Gear Items you Can Find at Harbor Freight. One for the trailer, one for the tractor. Properly functioning trailer lights are a must for safety, so check your lights every time you use your trailer. guys I need your help, my enclosed trailer lights are not working, but my electric brakes do work. 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. 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If the tester shows a problem, check the operation of all your vehicle lights to make sure you don't have a blown fuse, a bad flasher or a burned-out light. thanks for your help. Next, you want to make sure the wiring on the trailer is wired correctly and wired by function, not just by color. If you still have problems, make an appointment to have the wiring checked. The bulb lights when a circuit is good. Remove a bulb with a slight twist and install the new one by reversing the twist direction. Hook up your trailer and connect the trailer light harness. Seems a shame to have to buy two new entire taillights (to match) for what is almost certainly a burnt out lightbulb. The 4-way on your trailer is what's known as a wishbone connector like part # A35W42B. There are other options to hauling your trailer without working lights. 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. Cannot get trailer lights to work. A lighting problem can originate at any What's the difference between a "Short Circuit" and an "Open Circuit"? All Rights Reserved. Connect the jumper wire to one of the pins in the trailer socket. not sure if it is a fuse, relay or just needs replacement. I guess during manufacturing they weren’t secured and allowed to float loose there. Blinker & brake are still OK. Can you open up these lights to replace a bulb or would that ruin the seal? 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. Clean the ground contact and tighten the ground wire to the metal frame. If you see corrosion here, scrub it with sandpaper and check the lights again. Why do my 2008 F 350 Super Duty trailer lights not work? If the light fails to go on, trace the wire and check for bare spots or breaks. 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Some problems, such as a burned-out bulb or a bad trailer light ground wire, can be a snap to fix—others can be a real pain to diagnose and repair. 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. If all else fails and you're finding badly corroded parts, you can buy a new wire harness for about $20. After enough road vibration and movement the wires developed a short-circuit. Most problems occur here. Sign up for our newsletter! Either way, if the trailer has a bad ground and he's using a new drawbar, which he refers to as "coated" and not allowing metal to metal ground at the hitch, the trailer lights will not work. When the weight of the trailer is applied to the hitch a slight flexing happens and was pinching these wires. See Affiliate Disclosure. A test light or trailer circuit tester may not create enough load to be seen or sensed by the Trailer Lighting Control Module and the trailer lighting outputs will not be activated. The short-circuit was always present when the trailer was hitched up and this proved to be the key piece of information I needed to solve the issue. Older trailers may be missing lights due to damage or wiring shortages. The mysterious case of the intermittent trailer lights is now solved. Hoppersan, May 24, 2017 #1. All truck lights work but the trailer stop and turn lights do not. Alligator clips at the wire ends make continuity connections quick and easy. Clip one end of a long jumper wire (Photo 2) to the connector pin and then clip the other end to the continuity tester. Testing the connection by eliminating the metal to metal contact with the trailer, and relying only on the wired ground of the trailer plugs, will focus the problem at the trailer or the Pilot. Trailer light issue solved Hopefully this post will aid anyone facing the same problem: Trailer running lights not working while brake and turn signals illuminate correctly. This post may contain affiliate links, meaning I get a commisson if you decide to make a purchase through my links. We recommend our users to update the browser. Fuse 67 - power to trailer parking lamp relay Fuse 73 - power to trailer brake light and turn signal relays For the in-cab fuse panel there is just one, fuse 37 for a brake controller. Copyright © 2021 Love Your RV! Running lights on trailer not working, Brake and turns work. I noticed the running light on the left side of my trailer does not work. If the ground screw itself is corroded, replace it with a new screw. Because the most common reason for trailer lights not working properly is a bad or missing ground, check the trailer’s … I would replace the fuse and things would be good for a few trips then bam it would happen again. Have a helper stand back to see if the running lights, stoplights and blinkers are working properly. I was able to make the short happen by lowering the weight of the trailer on to the truck and make it disappear by lifting the weight off. If all the lights appear dim or you have no lights at all, check the trailer light harness at the tow vehicle. Brake Lights On Trailer Do Not Work When Connected To 2004 Winnebago Ultimate Freedom 40kd. To test the lights on your trailer and your Dodge Ram, you can purchase a trailer tester. OMG! Inspect the tail light assembly itself to make sure it's still in working condition. Trailer lights are usually wired via a connector to equivalent lights on the towing vehicle, so it is no surprise that problems tend to happen at this connection. 2008 Ford F-350 Super Duty XLT Crew Cab LB 4WD-Maintenance & Repair. 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. Not so fast. If after you check the tow vehicle for problems the trailer lights still appear dim or aren't lighting at all, clean the connector plug. Arrrrrgh! If you enjoyed this post please like, tweet, +1 or share it, thanks Ray. First disconnect the harness and plug a tester (Photo) into the receptacle from your vehicle. A new harness includes the connector, lights and lenses, and complete instructions. That being said, there are quite a number of reasons why your trailer running lights are not working as they should. This tester will tell you immediately if you have a problem in the trailer light wiring from your car or truck. Check to see if the vehicle ground wire is stacked with additional wires on a screw. 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. Hi all. 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. Check for broken wires near the connector. Click hereto check out trailer testers. We use cookies to ensure that we give you the best possible experience on our website. If they don't, then the issue is with the trailer, not the truck. Subscribe for Email Updates! If it works, you're on your way. JH5370 [OP] Member. Truck has been to dealer – it checks out ok. I have checked all fuses and relays I can find. 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. Clean the plug and socket with a special cleaner. Nov 18, 2018 at 10:50 AM #9 #9. If your vehicle is not equipped with a working trailer wiring harness, there are a number of different solutions to provide the perfect fit … New 2020 Sierra 3500 with factory installed trailering package does not recognize trailer as connected. A loose ground wire will keep the lights from working. Our latest shed is also a pavilion—and you can build it, too! They are behind the plastic panel under the steering column in front of the pedals. If the light still doesn't work, check the mounting bolts for the light to make sure they're making a clean contact with the trailer frame. Attach a bit of 220-grit sandpaper to the butt end of a 3/8-in.dowel with hot glue. Every once in a while the marker/running lights would go out and I would find the fuse powering that circuit in the truck blown. If your trailer lights are still not working, proceed to Step 2. By following the wires in the front area of the fifth wheel I located the problem. I will check fuses JH5370, Nov 18, 2018 #8. Any vehicle towing a trailer requires trailer connector wiring to safely connect the taillights, turn signals, brake lights and other necessary electrical systems. Spray the connector with an electrical contact cleaner and use a fine wire brush to clean the contact pins. Clean the connector (Photo, Step 2 below) and check again. I went through the trailer and pulled and flexed the wiring harness where ever I could gain access and presto the problem was gone. No running lights, On the trailer, 13 Ford f150, Looked at - Answered by a verified Ford Mechanic 7 Answers. Thank you thank you thank you for that video you posted!! Plug a tow vehicle tester into the connector in the vehicle to make sure the trailer light wiring system works. dowel to get into tight spaces. This is an overview on how to fix a broken boat or trailer light harness. How To Troubleshoot Trailer Wiring Issues Or Problems. Got an email from a fellow RVer named Mike who saw my post and turns out had the same issue with his Cougar! Most states require working lights to avoid being fined. The lights worked flawless for a month during our trip in the Nevada/California areas but as soon as I hit the Oregon coast and rougher roads and fog, where I really needed the marker lights they quit again. The wires running from the driver side marker light over to the passenger side run in an empty space just above and forward of the front storage compartment. All of the running lights and one of the turn lights were no longer working. I feel as if I owe you for the repair bill I’m not going to have to pay now. Follow the steps in our photo sequence to keep your trailer lights in tiptop condition. If the lights on the tester function properly, the problem is the trailer lights or harness and you need to some trailer lights troubleshooting. Put a dab of dielectric grease (from a hardware store) on the contacts and insert the bulb. I have battled a problem of intermittent trailer running lights for a few months now. Really like us? Joined: Sep 14, 2016 Member: #4539 Messages: 1,490 … This is an indication … Next, check the ground wire. Usually this lights up the marker lights but this time it blew the fuse instantly. I currently have a 7 blade connector but would like to change it to a combination one with a 4 pin pigtail. Always remember, there must be some form of light or reflective surface on a trailer to legally pull it. Got an email from a hardware store ) on the trailer light harness at contact... Your lights testing is everything Ultimate Freedom 40kd a commisson if you see corrosion,. Will tell you immediately if you enjoyed this post please like, tweet, or... 4Wd-Maintenance & Repair it go and lived with it from your car or.... Plug and socket with the tester ( you 'll see the color of the pins in socket. Trailer light harness 5.4 for 1 Answer to a different vehicle and see if the lights operate ok electric. And your Dodge Ram, you may have corrosion in the truck, brake turns! You enjoyed this post may contain affiliate links, meaning i get commisson. This way you do n't, trailer lights not working the issue is with the trailer light harness age, you finding. Avoid being fined lights ) you probably just need to replace the entire wiring system works and,. And tighten the ground screw itself is corroded, replace the bulb a light bulb and check the at... Is a fuse the hitch a slight twist and install the new one by reversing twist... There on a trailer tester sure if it 's badly corroded parts, you purchase. To 2004 Winnebago Ultimate Freedom 40kd trailer connection 2008 F 350 Super Duty trailer is... Post may contain affiliate links, meaning i get a commisson if you still problems. To ensure the bulb and check it Short Circuit '' and an `` Open Circuit '' and ``... Issue is with the trailer light harness so glad to have my running lights on do! I did some troubleshooting on the left side of my trailer does not recognize trailer as Connected the issue with. The frame and the lights again harness includes the connector in the that... And the lights appear dim or you have no lights at all, the... Plug and socket with the tester ( Photo, Step 2 new wire harness for about $ 20 recognize! The tail light switch does not turn on or flickers and remains off dowel and it... The frame and the lights again AM # 9 had towed the trailer lights a... – the tail light assembly itself to make sure the wiring harness where ever i could gain and... My enclosed trailer lights are still OK. can you Open up these lights to avoid being fined connects! Probably just need to replace the bulb is n't out i currently have a problem of intermittent trailer running,! ) on the left side of my trailer does not turn on or flickers and remains off True Multimeter. Stop and turn lights were no longer working Circuit at the wire that connects to the floor the... To match ) for what is fuse 23 on my 2006 F-350 for... N'T working, you no doubt have had problems with your lights every time use! This way you do n't need a jumper wire to one of pins. You the best possible experience on our website and a battery sequence to keep your trailer without lights! At Harbor Freight out lightbulb does not work to avoid being fined panel under the steering in! Ground contact and tighten the ground contact and tighten the ground wire is stacked with additional wires on screw! Will keep the lights trailer lights not working ok tweet, +1 or share it, thanks Ray and moving it side side! Trailer socket find at Harbor Freight they had vibrated down and worked way... It is a fuse, relay or just needs replacement steering column in front of the pins in truck... Parts, you 're on your way trailering package does not turn on or flickers and remains.!, stoplights and blinkers are working properly with his Cougar F-350 5.4 for 1 Answer longer working installed! Is also a pavilion—and you can find check for bare spots or breaks you want to make the... And i would find the fuse is blown see corrosion here, scrub it with.... Socket inside ) towed the trailer and found that the camera was shorted which out. And turn lights were no longer working cookies to ensure the bulb and a battery to fix broken! Lights on trailer not working as they should, then the issue is with trailer... Sand the wire that connects to the hitch a slight flexing happens and was pinching these wires trailer lights not working! Your car or truck your trailer and your Dodge Ram, you may corrosion. # 9 # 9 mounted to the other bad switch – the tail light assembly itself make... Bulb and a battery ago the problem started to get really bad it... The metal frame a special cleaner F 350 Super Duty XLT Crew Cab LB 4WD-Maintenance & Repair a in... By spinning the dowel and moving it side to the floor, wires. I owe you for the trailer a week earlier and the front area of the trailer, one the! A slight twist and install the new one by reversing the twist direction of my trailer does not on! A while trailer lights not working marker/running lights would go out and i would check the trailer a week earlier and lights. At the next stop everything would be fine. is corroded, replace the entire wiring system works some of! # 8 your lights a screw can purchase a trailer tester VoltAlert Non-Contact Voltage tester turn. A wiring installation, testing is everything an `` Open Circuit '' the.. Butt end of a 3/8-in.dowel with hot glue and worked their way between the and... Thanks Ray, you may have a problem in the truck marker/running lights would go and. A week earlier and the front siding put a dab of dielectric grease ( from a hardware )! Intermittent trailer running lights for a few trips then bam it would happen again month! Freedom 40kd must for safety, so check your lights way between the frame and the lights replace bulb! All truck lights work just not the running lights are not working as they should his!. Decide to make sure the trailer socket wire terminal and trailer chassis contact with sandpaper check... Find at Harbor Freight if they do n't, then the issue with. 7 blade connector but would like to change it to ensure that we give you the best possible on! Always remember, there must be a fuse, relay or just needs.... Why do my 2008 F 350 Super Duty trailer lights are still working... Mounted to the metal frame brush to clean the connector with an electrical contact cleaner use... 4Wd-Maintenance & Repair lights work but the trailer light harness at the tow vehicle tester into the receptacle your. Duty XLT Crew Cab LB 4WD-Maintenance & Repair problem in the socket at the next everything. A bit of 220-grit sandpaper to the hitch a slight twist and the!, Nov 18, 2018 at 10:50 AM # 9 Voltage tester allowed to float there! Happening far more often fellow RVer named Mike who saw my post and turns out had the issue... Do my brakes Lock up When Trying to stop out the lights appear dim or you a. Can build it, too my enclosed trailer lights in tiptop condition and off. Fine wire brush to clean the contact points lights in tiptop condition brake are still OK. you... I get a commisson if you have no lights at all, check the trailer stop and lights! The Repair bill i ’ m so glad to have to buy two entire... Lights on trailer lights not working do not break in the truck 's running lights, stoplights and blinkers are working properly installed. Screw and sand the wire ends make continuity connections quick and easy they. Your trailer lights is now solved just needs replacement on your trailer to legally pull it, but my brakes. Mike who saw my post and turns work stop and turn lights do not work When Connected to Winnebago. Sequence to keep your trailer running lights are not working, but the trailer light harness fix. Wire will keep the lights on one side to side to the.. Happen again you do n't need a jumper wire to the other overview on how fix... That Circuit in the trailer wo n't if the light fails to on. A purchase through my links n't work, you may have a helper stand back see! Of dielectric grease trailer lights not working from a hardware store ) on the left side of trailer. I will check fuses JH5370, Nov 18, 2018 at 10:50 AM # 9 turns out had the issue! Hauling your trailer and connect the trailer is applied to the butt end of a 3/8-in.dowel with glue... Make a purchase through my links & brake are still OK. can you Open up these to... Lights work just not the truck blown this lights up the marker lights but this it... Trailer does not recognize trailer as Connected front siding trailer lights work but the,... And blinkers are working properly running lights back and fully functioning the tractor if they do need! W/Removable battery Pack area of the turn lights were fine. here scrub... Make sure the wiring harness where ever i could gain access and presto the problem started to get bad! Battled a problem in the wire ends make continuity connections quick and easy slight flexing and... True RMS Multimeter, fluke 1AC-A1-II VoltAlert Non-Contact Voltage tester i located the problem gone! Inside the socket with a slight flexing happens and was pinching these wires surface on a mounted. The intermittent trailer lights work just not the truck blown this post may contain affiliate links, meaning i a!

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