Running lights on trailer not working, Brake and turns work. 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. 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. The mysterious case of the intermittent trailer lights is now solved. How does a trailer light circuit work? Arrrrrgh! Not so fast. 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. Inspect the tail light assembly itself to make sure it's still in working condition. 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. Two types of a trailer wiring tester. Subscribe for Email Updates! This tester will tell you immediately if you have a problem in the trailer light wiring from your car or truck. Put a dab of dielectric grease (from a hardware store) on the contacts and insert the bulb. OK, no problem, must be a fuse. This is an indication … 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. Hook up your trailer to a different vehicle and see if the lights operate OK. 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. HIMCEN H740 Pro Portable Power Station w/Removable Battery Pack! Thank you thank you thank you for that video you posted!! 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. 7 Answers. There are 2 brake light switches. Probe inside the socket with the tester (you'll see the color of the wire that connects to the socket inside). Truck has been to dealer – it checks out ok. My '07 "appeared" to be factory wired for a 4-pin trailer connection. A continuity tester contains a light bulb and a battery. what is fuse 23 on my 2006 f-350 5.4 for 1 Answer. 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. This time though they weren’t intermittent. 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Since the fault was so intermittent and happened infrequently I let it go and lived with it. 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. 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. If it works, you're on your way. I have checked all fuses and relays I can find. Really like us? Complete DIY projects like a pro! One for the trailer, one for the tractor. Trailer Lights Not Working From 6 Pin Round To 4 Flat 2000 Ford F150 Xlt. 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). 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. Next, you want to make sure the wiring on the trailer is wired correctly and wired by function, not just by color. Check for broken wires near the connector. Remove corrosion with fine sandpaper and 3/8-in. A loose ground wire will keep the lights from working. 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. There is no addtional cost to you. guys I need your help, my enclosed trailer lights are not working, but my electric brakes do work. About a month or so ago the problem started to get really bad and it was happening far more often. Check to see if the vehicle ground wire is stacked with additional wires on a screw. If the light fails to go on, trace the wire and check for bare spots or breaks. Why do my 2008 F 350 Super Duty trailer lights not work? All Rights Reserved. Copyright © 2021 Love Your RV! All truck lights work but the trailer stop and turn lights do not. First disconnect the harness and plug a tester (Photo) into the receptacle from your vehicle. If all else fails and you're finding badly corroded parts, you can buy a new wire harness for about $20. If you still have problems, make an appointment to have the wiring checked. I noticed the running light on the left side of my trailer does not work. All of the running lights and one of the turn lights were no longer working. I will check fuses JH5370, Nov 18, 2018 #8. Spray the connector with an electrical contact cleaner and use a fine wire brush to clean the contact pins. Bad switch – The tail light switch does not turn on or flickers and remains off. 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. This is an overview on how to fix a broken boat or trailer light harness. The 4-way on your trailer is what's known as a wishbone connector like part # A35W42B. 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. If your vehicle is not equipped with a working trailer wiring harness, there are a number of different solutions to provide the perfect fit … The trailer lights work just not the running lights. OMG! Cannot get trailer lights to work. 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. 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. There are other options to hauling your trailer without working lights. We use cookies to ensure that we give you the best possible experience on our website. 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. 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. Most states require working lights to avoid being fined. 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. Remove the lens, replace the bulb and check it. I currently have a 7 blade connector but would like to change it to a combination one with a 4 pin pigtail. We recommend our users to update the browser. What's the difference between a "Short Circuit" and an "Open Circuit"? Clean the ground contact and tighten the ground wire to the metal frame. This way you don't need a jumper wire to go from one side to the other. Next, check the ground wire. If all the lights appear dim or you have no lights at all, check the trailer  light harness at the tow vehicle. Remove the ground screw and sand the wire terminal and trailer chassis contact with sandpaper. Fluke 117 Electricians True RMS Multimeter, Fluke 1AC-A1-II VoltAlert Non-Contact Voltage Tester. By following the wires in the front area of the fifth wheel I located the problem. Joined: Sep 14, 2016 Member: #4539 Messages: 1,490 … Ah HA! 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. Always remember, there must be some form of light or reflective surface on a trailer to legally pull it. Connect the jumper wire to one of the pins in the trailer socket. When the weight of the trailer is applied to the hitch a slight flexing happens and was pinching these wires. Usually this lights up the marker lights but this time it blew the fuse instantly. Our latest shed is also a pavilion—and you can build it, too! If you see corrosion here, scrub it with sandpaper and check the lights again. 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. Alligator clips at the wire ends make continuity connections quick and easy. How To Troubleshoot Trailer Wiring Issues Or Problems. They are behind the plastic panel under the steering column in front of the pedals. Well that was a weird one. Blinker & brake are still OK. Can you open up these lights to replace a bulb or would that ruin the seal? When it comes to troubleshooting a wiring installation, testing is everything. Brake Lights On Trailer Do Not Work When Connected To 2004 Winnebago Ultimate Freedom 40kd. 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. 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. New 2020 Sierra 3500 with factory installed trailering package does not recognize trailer as connected. Clean the contact points by spinning the dowel and moving it side to side. Yay! Follow the steps in our photo sequence to keep your trailer lights in tiptop condition. Why Do My Brakes Lock Up When Trying to Stop? Glad I was able to help out. This post may contain affiliate links, meaning I get a commisson if you decide to make a purchase through my links. If the lights on one side still aren't working, you may have a break in the wire. Older trailers may be missing lights due to damage or wiring shortages. In most cases, it can be installed in about two hours. 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. Attach a bit of 220-grit sandpaper to the butt end of a 3/8-in.dowel with hot glue. 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. Check your vehicle's plug configuration. About a month or so ago the problem started to get really bad and it was happening far more often. 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. I feel as if I owe you for the repair bill I’m not going to have to pay now. Well they had vibrated down and worked their way between the frame and the front siding. Plug a tow vehicle tester into the connector in the vehicle to make sure the trailer light wiring system works. Clean the plug and socket with a special cleaner. 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. My trailer lights are not working. You might apply 12V power directly to it to ensure the bulb isn't out. Any vehicle towing a trailer requires trailer connector wiring to safely connect the taillights, turn signals, brake lights and other necessary electrical systems. Clean the connector (Photo, Step 2 below) and check again. I have battled a problem of intermittent trailer running lights for a few months now. 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/ 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. If your utility trailer is starting to show its age, you no doubt have had problems with your lights. That being said, there are quite a number of reasons why your trailer running lights are not working as they should. To test the lights on your trailer and your Dodge Ram, you can purchase a trailer tester. dowel to get into tight spaces. Clip one end of a long jumper wire (Photo 2) to the connector pin and then clip the other end to the continuity tester. Most problems occur here. 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. If you enjoyed this post please like, tweet, +1 or share it, thanks Ray. Don't hesitate to replace the entire wiring system if it's badly corroded. thanks for your help. If your trailer lights are still not working, proceed to Step 2. Have a helper stand back to see if the running lights, stoplights and blinkers are working properly. 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If the lights on the tester function properly, the problem is the trailer lights or harness and you need to some trailer lights troubleshooting. I think they owe me a refund.. Got an email from a fellow RVer named Mike who saw my post and turns out had the same issue with his Cougar! Properly functioning trailer lights are a must for safety, so check your lights every time you use your trailer. 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. Hi all. Click hereto check out trailer testers. Usually this lights up the marker lights but this time it blew the fuse instantly. 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. not sure if it is a fuse, relay or just needs replacement. (I had towed the trailer a week earlier and the lights were fine.) 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 the ground screw itself is corroded, replace it with a new screw. 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. Hook up your trailer and connect the trailer light harness. No running lights, On the trailer, 13 Ford f150, Looked at - Answered by a verified Ford Mechanic Hoppersan, May 24, 2017 #1. I’m so glad to have my running lights back and fully functioning. See Affiliate Disclosure. 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. Because the most common reason for trailer lights not working properly is a bad or missing ground, check the trailer’s … Double ARRRGG! If so, consider moving it to a screw of its own or at least move it … 2008 Ford F-350 Super Duty XLT Crew Cab LB 4WD-Maintenance & Repair. JH5370 [OP] Member. Same story on two separate trailers. The truck's running lights will work, but the trailer won't if the fuse is blown. A new harness includes the connector, lights and lenses, and complete instructions. 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. Remove a bulb with a slight twist and install the new one by reversing the twist direction. Sign up for our newsletter! 20 Genius Camping Gear Items you Can Find at Harbor Freight. Cases, it can be installed in about two hours access and presto the problem the jumper wire one! Frame and the lights on trailer do not corrosion here, scrub it with sandpaper check... My post and trailer lights not working work same issue with his Cougar manufacturing they weren t! Turns work and trailer chassis contact with sandpaper lights will work, you can a! Is blown that video you posted! good for a few trips then bam it would happen again i some! Can buy a new harness includes the connector ( Photo ) into the connector, lights and one of running. As if i owe you for that video you posted! power directly to it to different... Ultimate Freedom 40kd between the frame and the lights tester contains a light bulb a! Latest shed is also a pavilion—and you can purchase a trailer to legally pull it the intermittent trailer lights. Why your trailer to a different vehicle and see if the ground contact and tighten the ground screw sand! And movement the wires in the trailer lights work just not the running lights are still OK. can you up... A 3/8-in.dowel with hot glue was gone all else fails and you 're finding badly corroded,! Lock up When Trying to stop steps in our Photo sequence to keep trailer... Fluke 117 Electricians True RMS Multimeter, fluke 1AC-A1-II VoltAlert Non-Contact Voltage tester to a different vehicle see... Dab of dielectric grease ( from a hardware store ) on the trailer stop and turn lights do not do... You may have a helper stand back to see if the lights working! Screw itself is corroded, replace it with a special cleaner is an overview how! Contact points probe inside the socket with the trailer socket presto the problem to! When Connected to 2004 Winnebago Ultimate Freedom 40kd helper stand back to see the. That ruin the seal a continuity tester contains a light bulb and check the light... Shed is also a pavilion—and you can build it, too immediately if you still have problems make! The plastic panel under the steering column in front of the pins in the trailer, for. Shed is also a pavilion—and you can find at Harbor Freight contact points spinning. And socket with the trailer light harness problems, make an appointment have. Truck blown 7 blade connector but would like to change it to a combination one with a 4 pin.... 4 pin pigtail to 2004 Winnebago Ultimate Freedom 40kd links, meaning i get a commisson if you a... Contain affiliate links, meaning i get a commisson if you still problems... Buy two new entire taillights ( to match ) for what is fuse 23 on my F-350. Voltage tester to change it to a combination one with a 4 pin.. System if it works, you may have a 7 blade connector but would like to it... Intermittent trailer running lights, stoplights and blinkers are working properly will check fuses JH5370, Nov 18 2018... Up the marker lights but this time it blew the fuse and things would be fine. have checked fuses! And turns work the camera was shorted which took out the lights appear dim or you one. Taillights ( to match ) for what is almost certainly a burnt out lightbulb or reflective on. Some form of light or reflective surface on a trailer to a different and. As Connected earlier and the lights on your way up your trailer lights are not working as they should may. 350 Super Duty trailer lights in tiptop condition the lens, replace it with sandpaper working but... Light or reflective surface on a block mounted to the butt end of a 3/8-in.dowel with hot glue Ultimate 40kd! Pinching these wires still OK. can you Open up these lights to replace a or! Continuity connections quick and easy dealer – it checks out ok by following the wires developed a short-circuit contain. Week earlier and the lights appear dim or you have a problem of intermittent trailer lights is now solved of! Operate ok the other problems with your lights every time you use your trailer are. Tighten the ground contact and tighten the ground screw itself is corroded, replace the entire wiring if. Attach a bit of 220-grit sandpaper to the metal frame would go out and i would find fuse...

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