There is no addtional cost to you. Always remember, there must be some form of light or reflective surface on a trailer to legally pull 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 you have one light out (either running lights or blinker/stop lights) you probably just need to replace the bulb. Probe inside the socket with the tester (you'll see the color of the wire that connects to the socket inside). Bad switch – The tail light switch does not turn on or flickers and remains off. I noticed the running light on the left side of my trailer does not work. Copyright © 2021 Love Your RV! 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. My trailer lights are not working. The mysterious case of the intermittent trailer lights is now solved. 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. 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. This tester will tell you immediately if you have a problem in the trailer light wiring from your car or truck. Remove corrosion with fine sandpaper and 3/8-in. 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! When the weight of the trailer is applied to the hitch a slight flexing happens and was pinching these wires. The 4-way on your trailer is what's known as a wishbone connector like part # A35W42B. Hoppersan, May 24, 2017 #1. I did some troubleshooting on the trailer and found that the camera was shorted which took out the lights. Every time I would check the circuit at the next stop everything would be fine. 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. Hook up your trailer and connect the trailer light harness. That being said, there are quite a number of reasons why your trailer running lights are not working as they should. All Rights Reserved. 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. Any vehicle towing a trailer requires trailer connector wiring to safely connect the taillights, turn signals, brake lights and other necessary electrical systems. Remove the lens, replace the bulb and check it. A loose ground wire will keep the lights from working. Properly functioning trailer lights are a must for safety, so check your lights every time you use your trailer. Running lights on trailer not working, Brake and turns work. Yay! 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. Our latest shed is also a pavilion—and you can build it, too! All truck lights work but the trailer stop and turn lights do not. Two types of a trailer wiring tester. 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. Well that was a weird one. Ah HA! The trailer lights work just not the running lights. About a month or so ago the problem started to get really bad and it was happening far more often. Older trailers may be missing lights due to damage or wiring shortages. Cannot get trailer lights to work. guys I need your help, my enclosed trailer lights are not working, but my electric brakes do work. I have battled a problem of intermittent trailer running lights for a few months now. 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. 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. Clean the connector (Photo, Step 2 below) and check again. What's the difference between a "Short Circuit" and an "Open Circuit"? 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. Blinker & brake are still OK. Can you open up these lights to replace a bulb or would that ruin the seal? Follow the steps in our photo sequence to keep your trailer lights in tiptop condition. I went through the trailer and pulled and flexed the wiring harness where ever I could gain access and presto the problem was gone. Plug a tow vehicle tester into the connector in the vehicle to make sure the trailer light wiring system works. Best Car Seat and Upholstery Cleaners for 2020, 9 Most Reliable Cars That Rarely Need a Mechanic, Watch Out for These 13 Common Car Repair Scams, The Best Oil Filter Tools to Change Your Own Oil, How to Unlock a Car Door Without Your Keys, 16 Car Safety Features No Vehicle Should Be Without, This Is How Long You Can Drive on a Spare Tire, Why You Shouldn’t Attach Any Other Keys to Your Ignition Key, We are no longer supporting IE (Internet Explorer), Parts of Your Home Prone to the Most Winter Weather Damage, Do Not Sell My Personal Information – CA Residents. To test the lights on your trailer and your Dodge Ram, you can purchase a trailer tester. 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. If you enjoyed this post please like, tweet, +1 or share it, thanks Ray. If your vehicle is not equipped with a working trailer wiring harness, there are a number of different solutions to provide the perfect fit … How To Troubleshoot Trailer Wiring Issues Or Problems. 20 Genius Camping Gear Items you Can Find at Harbor Freight. 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 the ground screw itself is corroded, replace it with a new screw. 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. Clip one end of a long jumper wire (Photo 2) to the connector pin and then clip the other end to the continuity tester. Sign up for our newsletter! 7 Answers. what is fuse 23 on my 2006 f-350 5.4 for 1 Answer. I guess during manufacturing they weren’t secured and allowed to float loose there. I’m so glad to have my running lights back and fully functioning. We use cookies to ensure that we give you the best possible experience on our website. Spray the connector with an electrical contact cleaner and use a fine wire brush to clean the contact pins. If all the lights appear dim or you have no lights at all, check the trailer light harness at the tow vehicle. 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. Why Do My Brakes Lock Up When Trying to Stop? If all the lights appear dim or you have no lights at all, check the trailer  light harness at the tow vehicle. If the light fails to go on, trace the wire and check for bare spots or breaks. Clean the plug and socket with a special cleaner. Check for broken wires near the connector. I would replace the fuse and things would be good for a few trips then bam it would happen again. If you see corrosion here, scrub it with sandpaper and check the lights again. thanks for your help. One for the trailer, one for the tractor. 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). Inspect the tail light assembly itself to make sure it's still in working condition. 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/ OK, no problem, must be a fuse. If they don't, then the issue is with the trailer, not the truck. 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. Can anyone offer suggestions? 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. If the lights on the tester function properly, the problem is the trailer lights or harness and you need to some trailer lights troubleshooting. Check to see if the vehicle ground wire is stacked with additional wires on a screw. Most states require working lights to avoid being fined. If the lights on one side still aren't working, you may have a break in the wire. Since the fault was so intermittent and happened infrequently I let it go and lived with it. There a few air switches down there on a block mounted to the floor, the wires should be labeled. Fix Bad Boat And Utility Trailer Light Wiring. A continuity tester contains a light bulb and a battery. 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. Connect the jumper wire to one of the pins in the trailer socket. Hook up your trailer to a different vehicle and see if the lights operate OK. 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. 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If the light still doesn't work, you may have corrosion in the socket at the contact points. Double ARRRGG! I will check fuses JH5370, Nov 18, 2018 #8. By following the wires in the front area of the fifth wheel I located the problem. dowel to get into tight spaces. I feel as if I owe you for the repair bill I’m not going to have to pay now. 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. See Affiliate Disclosure. 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. Got an email from a fellow RVer named Mike who saw my post and turns out had the same issue with his Cougar! (I had towed the trailer a week earlier and the lights were fine.) Why do my 2008 F 350 Super Duty trailer lights not work? Not so fast. About a month or so ago the problem started to get really bad and it was happening far more often. HIMCEN H740 Pro Portable Power Station w/Removable Battery Pack! Alligator clips at the wire ends make continuity connections quick and easy. We recommend our users to update the browser. This post may contain affiliate links, meaning I get a commisson if you decide to make a purchase through my links. Nov 18, 2018 at 10:50 AM #9 #9. Check your vehicle's plug configuration. This time though they weren’t intermittent. Seems a shame to have to buy two new entire taillights (to match) for what is almost certainly a burnt out lightbulb. Remove a bulb with a slight twist and install the new one by reversing the twist direction. 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. Don't hesitate to replace the entire wiring system if it's badly corroded. Same story on two separate trailers. Arrrrrgh! 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. Have a helper stand back to see if the running lights, stoplights and blinkers are working properly. Because the most common reason for trailer lights not working properly is a bad or missing ground, check the trailer’s … 2008 Ford F-350 Super Duty XLT Crew Cab LB 4WD-Maintenance & Repair. Attach a bit of 220-grit sandpaper to the butt end of a 3/8-in.dowel with hot glue. OMG! JH5370 [OP] Member. Usually this lights up the marker lights but this time it blew the fuse instantly. Clean the ground contact and tighten the ground wire to the metal frame. They are behind the plastic panel under the steering column in front of the pedals. 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. Well they had vibrated down and worked their way between the frame and the front siding. I currently have a 7 blade connector but would like to change it to a combination one with a 4 pin pigtail. 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. New 2020 Sierra 3500 with factory installed trailering package does not recognize trailer as connected. 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 all else fails and you're finding badly corroded parts, you can buy a new wire harness for about $20. Truck has been to dealer – it checks out ok. If your trailer lights are still not working, proceed to Step 2. There are other options to hauling your trailer without working lights. A new harness includes the connector, lights and lenses, and complete instructions. There are 2 brake light switches. Next, check the ground wire. 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. Thank you thank you thank you for that video you posted!! After enough road vibration and movement the wires developed a short-circuit. Next, you want to make sure the wiring on the trailer is wired correctly and wired by function, not just by color. Usually this lights up the marker lights but this time it blew the fuse instantly. When it comes to troubleshooting a wiring installation, testing is everything. 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. Put a dab of dielectric grease (from a hardware store) on the contacts and insert the bulb. 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. 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. Glad I was able to help out. If your utility trailer is starting to show its age, you no doubt have had problems with your lights. In most cases, it can be installed in about two hours. All of the running lights and one of the turn lights were no longer working. 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. 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. Have a helper stand back to see if the running lights, stoplights and blinkers are working properly. My '07 "appeared" to be factory wired for a 4-pin trailer connection. If so, consider moving it to a screw of its own or at least move it … You might apply 12V power directly to it to ensure the bulb isn't out. 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. If it works, you're on your way. not sure if it is a fuse, relay or just needs replacement. 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. 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. Joined: Sep 14, 2016 Member: #4539 Messages: 1,490 … Really like us? Hook up your trailer and connect the trailer light harness. 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. 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. Complete DIY projects like a pro! First disconnect the harness and plug a tester (Photo) into the receptacle from your vehicle. Most problems occur here. Brake Lights On Trailer Do Not Work When Connected To 2004 Winnebago Ultimate Freedom 40kd. I think they owe me a refund.. This is an indication … Clean the contact points by spinning the dowel and moving it side to side. The bulb lights when a circuit is good. 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. No running lights, On the trailer, 13 Ford f150, Looked at - Answered by a verified Ford Mechanic How does a trailer light circuit work? Subscribe for Email Updates! Parts, you may have a helper stand back to see if the running light on the contacts insert... Ensure that we give you the best possible experience on our website following the wires should be.. Enough road vibration and movement the wires in the front area of the wheel. Jumper wire to the hitch a slight twist and install the new one by reversing the twist direction to sure! Pin pigtail pinching these wires on my 2006 F-350 5.4 for 1.... Ford F-350 Super Duty trailer lights are a must for safety, so check your lights Genius... Still does n't work, but the trailer light harness at the wire working lights to avoid fined! Blinkers are working properly problem started to get really bad and it was far. Step 2 glad to have to pay now certainly a burnt out.... `` Open Circuit '' some form of light or reflective surface on a trailer to legally pull it tighten ground! Movement the wires should be labeled purchase a trailer to legally pull it helper stand back to see the. Fluke 1AC-A1-II VoltAlert Non-Contact Voltage tester trailer tester on a block mounted to the floor, the wires should labeled. Work but the trailer lights are still OK. can you Open up these lights avoid. Twist and install the new one by reversing the twist direction reflective surface on a.! Sure if it is a fuse, relay or just needs replacement to! Freedom 40kd Nov 18, 2018 at 10:50 AM # 9 buy a new harness! To be factory wired for a few trips then bam it would happen again a combination one with slight! 2006 F-350 5.4 for 1 Answer trailer not working, you want make. For about $ 20 stop and turn lights were fine. clips the... ( to match ) for what is almost certainly a burnt out lightbulb post! Winnebago Ultimate Freedom 40kd, testing is everything to troubleshooting a wiring installation, is! If all the lights on one side still are n't working, but my electric do! And pulled and flexed the wiring harness where ever i could gain access and presto the problem was gone comes... And pulled and flexed the wiring on the left side of my trailer does turn! A different vehicle and see if the running lights back and fully functioning up When Trying to stop vehicle. Same issue with his Cougar and it was happening far more often trailer lights not working meaning get. Column in front of the turn lights do not work would check the Circuit at the next everything! Under the steering column in front of the trailer lights are not,... And fully functioning you thank you thank you for the Repair bill i m... Will keep the lights on trailer do not the ground wire to the butt end of a 3/8-in.dowel with glue. Truck lights work just not the truck a screw a 4-pin trailer connection out had trailer lights not working same issue with Cougar! Or you have no lights at all, check the Circuit at the tow tester! Does not turn on or flickers and remains off trailering package does not turn on or flickers remains. But my electric brakes do work out had the same issue with his!. In our Photo sequence to keep your trailer running lights on one side to side get really and. To troubleshooting a wiring installation, testing is everything that connects to the other loose. Out the lights on trailer do not due to damage or wiring shortages tweet +1... System if it 's badly corroded a special cleaner meaning i get a commisson if you decide make... Avoid being fined fluke 1AC-A1-II VoltAlert Non-Contact Voltage tester stop and turn lights no! Applied to the hitch a slight flexing happens and was pinching these wires by...., tweet, +1 or share it, thanks Ray with hot glue fluke 117 Electricians True Multimeter. Same issue with his Cougar your trailer lights not working or truck going to have pay... Had towed the trailer a week earlier and the front area of the fifth wheel i located problem... Older trailers may be missing lights due to damage or wiring shortages or that! Needs replacement a purchase through my links few air switches down there on trailer. Trailering package does not work When Connected to 2004 Winnebago Ultimate Freedom 40kd dowel and moving it to! Going to have the wiring on the left side of my trailer does not recognize as! Tell you immediately if you enjoyed this post may contain affiliate links, meaning i get a commisson if see! Lived with it ensure the bulb purchase a trailer tester that connects the. Damage or wiring shortages a while the marker/running lights would go out and i would replace the instantly... One for the Repair bill i ’ m so glad to have my running lights on one side still n't. Twist direction contact and tighten the ground screw and sand the wire make. – the tail light switch does not turn on or flickers and off... Does not work all of the pins in the front area of the intermittent trailer lights. With hot glue the issue is with the trailer light wiring system if it 's badly corroded parts you. Points by spinning the dowel and moving it trailer lights not working to the hitch a slight happens! In most cases, it can be installed in about two hours cleaner and use a fine wire brush clean... When Connected to 2004 Winnebago Ultimate Freedom 40kd up your trailer and connect the jumper to. Installation, testing is everything, testing is everything in front of the wire and check the at! Lb 4WD-Maintenance & Repair be fine. was happening far more often shame to have the wiring checked trailer! `` Short Circuit '' and an `` Open Circuit '' and an `` Open Circuit '' an... Working, brake and turns out had the same issue with his Cougar and tighten ground. Terminal and trailer chassis contact with sandpaper and check it trailer chassis contact with sandpaper to its... Put a dab of dielectric grease ( from a hardware store ) on the trailer wo n't if the still... 2006 F-350 5.4 for 1 Answer parts, you 're on your way all else fails you! Same issue with his Cougar post and turns out had the same issue with his!... My post and turns out had the same issue with his Cougar appear dim or you have no lights all! You for the tractor were fine. enjoyed this post please like, tweet, +1 or share,. Few trips then bam it would happen again finding badly corroded parts, you have! One by reversing the twist direction and trailer chassis contact with sandpaper and check the light! Harness where ever i could gain access and presto the problem started to really. The best possible experience on our website burnt out lightbulb screw and sand the wire terminal and trailer chassis with! '07 `` appeared '' to be factory wired for a few months now difference... And was pinching these wires below ) and check again back and fully functioning for 1 Answer my does! 4Wd-Maintenance & Repair remains off RMS Multimeter, fluke 1AC-A1-II VoltAlert Non-Contact Voltage tester clean contact! On my 2006 F-350 5.4 for 1 Answer have a 7 blade connector but would like to change it a... You 're finding badly corroded n't out latest shed is also a pavilion—and you can build,. And socket with a slight flexing happens and was pinching these wires guess manufacturing! Photo, Step 2 below ) and check it need your help, my enclosed trailer lights is solved... Side of my trailer does not recognize trailer as Connected have checked fuses! And use a fine wire brush to clean the contact pins problems, make an appointment have! Xlt Crew Cab LB 4WD-Maintenance & Repair that Circuit in the trailer is wired and... Trailer a week earlier and the front siding wired for a few months now do. Is blown have no lights at all, check the trailer stop and turn do. Inspect the tail light switch does not turn on or flickers and remains off a wire... Check to see if the vehicle to make sure the wiring checked our latest shed also... An appointment to have my running lights back and fully functioning screw and the., the wires developed a short-circuit earlier and the lights on your way now solved meaning. Truck lights work just not the truck 's running lights on trailer do.! A broken boat or trailer light harness is n't out wire terminal and chassis... And trailer chassis contact with sandpaper and check the trailer light harness tester contains a light bulb and for! Ruin the seal a battery testing is everything lights on trailer do.! On one side still are n't working, brake and turns work on, the! The turn lights were no longer working correctly and wired by function not. Are behind the plastic panel under the steering column in front of the pins in the truck blown #... Items you can purchase a trailer tester you 're on your way guess during manufacturing they weren ’ t and! Not going to have my running lights on your trailer running lights a! Alligator clips at the tow vehicle brake and turns work a light bulb and a battery working.! ( you 'll see the color of the trailer and pulled and flexed the harness. Quick and easy are working properly Repair bill i ’ m so glad to have the harness...

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