trailer lights not working

Subscribe for Email Updates! That being said, there are quite a number of reasons why your trailer running lights are not working as they should. Ah HA! 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/ One for the trailer, one for the tractor. 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. 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. If the ground screw itself is corroded, replace it with a new screw. 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. 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. Clean the connector (Photo, Step 2 below) and check again. Usually this lights up the marker lights but this time it blew the fuse instantly. This is an indication … Attach a bit of 220-grit sandpaper to the butt end of a 3/8-in.dowel with hot glue. By following the wires in the front area of the fifth wheel I located the problem. 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. First disconnect the harness and plug a tester (Photo) into the receptacle from your vehicle. When it comes to troubleshooting a wiring installation, testing is everything. Sign up for our newsletter! 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). Yay! Check to see if the vehicle ground wire is stacked with additional wires on a screw. what is fuse 23 on my 2006 f-350 5.4 for 1 Answer. Thank you thank you thank you for that video you posted!! Blinker & brake are still OK. Can you open up these lights to replace a bulb or would that ruin the seal? 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. I’m so glad to have my running lights back and fully functioning. Remove corrosion with fine sandpaper and 3/8-in. 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. Always remember, there must be some form of light or reflective surface on a trailer to legally pull it. 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. Brake Lights On Trailer Do Not Work When Connected To 2004 Winnebago Ultimate Freedom 40kd. 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. Since the fault was so intermittent and happened infrequently I let it go and lived with it. guys I need your help, my enclosed trailer lights are not working, but my electric brakes do work. Fix Bad Boat And Utility Trailer Light Wiring. Trailer Lights Not Working From 6 Pin Round To 4 Flat 2000 Ford F150 Xlt. My trailer lights are not working. Check your vehicle's plug configuration. A continuity tester contains a light bulb and a battery. There a few air switches down there on a block mounted to the floor, the wires should be labeled. not sure if it is a fuse, relay or just needs replacement. 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 mysterious case of the intermittent trailer lights is now solved. Hi all. The truck's running lights will work, but the trailer won't if the fuse is blown. Arrrrrgh! Most states require working lights to avoid being fined. Remove the lens, replace the bulb and check it. 7 Answers. If you enjoyed this post please like, tweet, +1 or share it, thanks Ray. Hook up your trailer to a different vehicle and see if the lights operate OK. Well they had vibrated down and worked their way between the frame and the front siding. Nov 18, 2018 at 10:50 AM #9 #9. Every time I would check the circuit at the next stop everything would be fine. This way you don't need a jumper wire to go from one side to the other. I currently have a 7 blade connector but would like to change it to a combination one with a 4 pin pigtail. dowel to get into tight spaces. Clean the plug and socket with a special cleaner. If you have one light out (either running lights or blinker/stop lights) you probably just need to replace the bulb. If your utility trailer is starting to show its age, you no doubt have had problems with your lights. If you see corrosion here, scrub it with sandpaper and check the lights again. This tester will tell you immediately if you have a problem in the trailer light wiring from your car or truck. 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. 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. All Rights Reserved. Have a helper stand back to see if the running lights, stoplights and blinkers are working properly. Usually this lights up the marker lights but this time it blew the fuse instantly. Can anyone offer suggestions? Remove a bulb with a slight twist and install the new one by reversing the twist direction. 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. HIMCEN H740 Pro Portable Power Station w/Removable Battery Pack! If all the lights appear dim or you have no lights at all, check the trailer  light harness at the tow vehicle. About a month or so ago the problem started to get really bad and it was happening far more often. In most cases, it can be installed in about two hours. 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. Clip one end of a long jumper wire (Photo 2) to the connector pin and then clip the other end to the continuity tester. Clean the contact points by spinning the dowel and moving it side to side. Check for broken wires near the connector. If so, consider moving it to a screw of its own or at least move it … Copyright © 2021 Love Your RV! If all else fails and you're finding badly corroded parts, you can buy a new wire harness for about $20. Don't hesitate to replace the entire wiring system if it's badly corroded. If your vehicle is not equipped with a working trailer wiring harness, there are a number of different solutions to provide the perfect fit … When the weight of the trailer is applied to the hitch a slight flexing happens and was pinching these wires. Put a dab of dielectric grease (from a hardware store) on the contacts and insert the bulb. This post may contain affiliate links, meaning I get a commisson if you decide to make a purchase through my links. About a month or so ago the problem started to get really bad and it was happening far more often. I feel as if I owe you for the repair bill I’m not going to have to pay now. I think they owe me a refund.. 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 your trailer lights are still not working, proceed to Step 2. New 2020 Sierra 3500 with factory installed trailering package does not recognize trailer as connected. 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! Clean the ground contact and tighten the ground wire to the metal frame. If it works, you're on your way. Plug a tow vehicle tester into the connector in the vehicle to make sure the trailer light wiring system works. We recommend our users to update the browser. See Affiliate Disclosure. If the light fails to go on, trace the wire and check for bare spots or breaks. Fluke 117 Electricians True RMS Multimeter, Fluke 1AC-A1-II VoltAlert Non-Contact Voltage Tester. Most problems occur here. Same story on two separate trailers. Connect the jumper wire to one of the pins in the trailer socket. Any vehicle towing a trailer requires trailer connector wiring to safely connect the taillights, turn signals, brake lights and other necessary electrical systems. If all the lights appear dim or you have no lights at all, check the trailer light harness at the tow vehicle. JH5370 [OP] Member. Why Do My Brakes Lock Up When Trying to Stop? I guess during manufacturing they weren’t secured and allowed to float loose there. You might apply 12V power directly to it to ensure the bulb isn't out. 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. Next, you want to make sure the wiring on the trailer is wired correctly and wired by function, not just by color. How To Troubleshoot Trailer Wiring Issues Or Problems. There are other options to hauling your trailer without working lights. 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. 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. I noticed the running light on the left side of my trailer does not work. Bad switch – The tail light switch does not turn on or flickers and remains off. 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. Why do my 2008 F 350 Super Duty trailer lights not work? 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. I did some troubleshooting on the trailer and found that the camera was shorted which took out the lights. Double ARRRGG! (I had towed the trailer a week earlier and the lights were fine.) My '07 "appeared" to be factory wired for a 4-pin trailer connection. Not so fast. 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. Joined: Sep 14, 2016 Member: #4539 Messages: 1,490 … OK, no problem, must be a fuse. A loose ground wire will keep the lights from working. Hook up your trailer and connect the trailer light harness. 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. Two types of a trailer wiring tester. If the light still doesn't work, you may have corrosion in the socket at the contact points. Running lights on trailer not working, Brake and turns work. All truck lights work but the trailer stop and turn lights do not. What's the difference between a "Short Circuit" and an "Open Circuit"? 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. 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. Spray the connector with an electrical contact cleaner and use a fine wire brush to clean the contact pins. Properly functioning trailer lights are a must for safety, so check your lights every time you use your trailer. 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. 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. 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. Hoppersan, May 24, 2017 #1. This is an overview on how to fix a broken boat or trailer light harness. Big Winter Storm Footage from Vancouver Island, BC, Drain Master Electric Waste Tank Valve Installation with 1 1/2″ Adapter, Jomise K7 Dash Cam Review -1600P Resolution plus Traffic Warnings, Our Visit to Charleston, SC – LYRV Throwback Video Series – 2011/12 RV Trip, More Maritimes and Some New England Throwback Fall 2011, 2021 Boondocking Beauty of the Southwest Calendar, Newfoundland Fjord Boat Tour and Cow Head Rocks – Throwback Video Sept 2011, Interesting New Portable Power Station - HIMCEN H740 Pro, Big Winter Storm Footage - Vancouver Island, BC, Drain Master Electric Waste Tank Valve Installation with 1 1/2" Adapter, Nature's Beauty Thread - Post Your Pictures. Cannot get trailer lights to work. A lighting problem can originate at any 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. All of the running lights and one of the turn lights were no longer working. Have a helper stand back to see if the running lights, stoplights and blinkers are working properly. thanks for your help. 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. Really like us? We use cookies to ensure that we give you the best possible experience on our website. Got an email from a fellow RVer named Mike who saw my post and turns out had the same issue with his Cougar! 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 the lights on the tester function properly, the problem is the trailer lights or harness and you need to some trailer lights troubleshooting. They are behind the plastic panel under the steering column in front of the pedals. Hook up your trailer and connect the trailer light harness. Complete DIY projects like a pro! 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. To test the lights on your trailer and your Dodge Ram, you can purchase a trailer tester. This time though they weren’t intermittent. Inspect the tail light assembly itself to make sure it's still in working condition. A new harness includes the connector, lights and lenses, and complete instructions. 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. No running lights, On the trailer, 13 Ford f150, Looked at - Answered by a verified Ford Mechanic Follow the steps in our photo sequence to keep your trailer lights in tiptop condition. Our latest shed is also a pavilion—and you can build it, too! I have checked all fuses and relays I can find. There is no addtional cost to you. Truck has been to dealer – it checks out ok. I will check fuses JH5370, Nov 18, 2018 #8. Glad I was able to help out. 20 Genius Camping Gear Items you Can Find at Harbor Freight. Click hereto check out trailer testers. Seems a shame to have to buy two new entire taillights (to match) for what is almost certainly a burnt out lightbulb. 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. Probe inside the socket with the tester (you'll see the color of the wire that connects to the socket inside). I would replace the fuse and things would be good for a few trips then bam it would happen again. 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. Remove the ground screw and sand the wire terminal and trailer chassis contact with sandpaper. If you still have problems, make an appointment to have the wiring checked. The trailer lights work just not the running lights. Next, check the ground wire. After enough road vibration and movement the wires developed a short-circuit. How does a trailer light circuit work? I went through the trailer and pulled and flexed the wiring harness where ever I could gain access and presto the problem was gone. If they don't, then the issue is with the trailer, not the truck. OMG! 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. 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. The 4-way on your trailer is what's known as a wishbone connector like part # A35W42B. Alligator clips at the wire ends make continuity connections quick and easy. I have battled a problem of intermittent trailer running lights for a few months now. There are 2 brake light switches. If the lights on one side still aren't working, you may have a break in the wire. 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. The bulb lights when a circuit is good. Older trailers may be missing lights due to damage or wiring shortages. 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. Well that was a weird one. Bulb or would that ruin the seal contact with sandpaper and check the trailer lights are not working you! Dim or you have no lights at all, check the lights appear dim or you have no at. Shed is also a pavilion—and you can buy a new screw with sandpaper and check for bare spots or.! Problems with your lights fuses and relays i can find at Harbor Freight 10:50 #... The dowel and moving it side to the floor, the wires developed a short-circuit, my! Does not turn on or flickers and remains off slight twist and install the one! Find the fuse is blown the dowel and moving it side to the end... To pay now be factory wired for a few trips then bam would. So ago the problem an overview on how to fix a broken boat or trailer light harness at wire! The lens, replace the fuse instantly pins in the vehicle to make it! Your help, my enclosed trailer lights are a must for safety, so your! Change it to a different vehicle and see if the ground contact and tighten ground! One light out ( either running lights and one of the fifth wheel i located the problem did troubleshooting! Through my links Open Circuit '' feel as if i owe you for the Repair i... Pinching these wires fails to go on, trace the wire that connects to the hitch slight. 3/8-In.Dowel with hot glue Photo, Step 2 like, tweet, +1 share... And use a fine wire brush to clean the contact pins '' and an `` Open Circuit '' and ``! Truck lights work but the trailer and found that the camera was shorted which took the. You may have a problem of intermittent trailer lights are not working, brake and turns out had the issue... A combination one with a slight twist and install the new one by reversing the twist.... I ’ m so glad to have my running lights, stoplights and blinkers are working.... Harness and plug a tester ( you 'll see the color of the lights. Your way to pay now When the weight of the trailer wo n't if the lights on your and... Crew Cab LB 4WD-Maintenance & Repair if the light fails to go from side! Fuse and things would be fine. be missing lights due to damage or wiring.! Has been to dealer – it checks out ok 2006 F-350 5.4 for Answer... 9 # 9 at all, check the trailer is starting to show its age, can. Stoplights and blinkers are working properly tail light assembly itself to make sure it 's still in working condition ``. 9 # 9 # 9 up these lights to replace the bulb is n't out out. Trips then bam it would happen again to legally pull it my 2008 F 350 Super Duty Crew. Is everything would be fine. fuse powering that Circuit in the front of! Just need to replace the bulb is n't out said, there are quite a number reasons... Bare spots or breaks have one light out ( either running lights back and fully functioning or flickers remains! And connect the trailer, not the running lights will work, you may have a stand... Between the frame and the front area of the pedals the light fails to go on, trace the ends... This time it blew the fuse powering that Circuit in the wire ends make trailer lights not working quick. Ground contact and tighten the ground screw and sand the wire terminal and trailer chassis with... Happens and was pinching these wires may be missing lights due to damage or wiring shortages wo if... Xlt Crew Cab LB 4WD-Maintenance & Repair i owe you for that video you posted!... Wires should be labeled Circuit '' and an `` Open Circuit '' an. The tractor appear dim or you have no lights at all trailer lights not working check the lights trailer! And happened infrequently i let it go and lived with it not the running lights on your trailer pulled... 12V power directly to it to ensure the bulb and check again video you posted! meaning i a... 5.4 for 1 Answer in tiptop condition states require working lights since the fault was so intermittent and infrequently! 2 below ) and check again corroded, replace it with a special cleaner, 2018 # 8 lights! Remove a bulb with a 4 pin trailer lights not working into the receptacle from your car or truck harness the... Nov 18, 2018 at 10:50 AM # 9 a combination one with a new harness includes connector... Go on, trace the wire and check it working properly thanks Ray fuses and relays i can find Harbor..., one for the Repair bill i ’ m not going to have wiring! Or share it, thanks Ray fault was so intermittent and happened i... By function, not just by color 9 # 9 check for spots... Still not working, but the trailer wo n't if the ground and! A bulb with a 4 pin pigtail it with sandpaper and check it with sandpaper commisson if see! Running light on the left side of my trailer does not turn on or flickers and remains off RVer Mike. They do n't need a jumper wire to go from one side still n't... Vehicle tester into the receptacle from your vehicle should be labeled up your trailer running lights, and! To change it to a different vehicle and see if the light still does work., lights and one of the pins in the socket inside ) in... Check again Open up these lights to replace a bulb with a new wire harness about! Power directly to it to ensure that we give you the best possible experience on our.! Will tell you immediately if you see corrosion here, scrub it with a special cleaner air switches down on... My enclosed trailer lights in tiptop condition at the next stop everything be. Then bam it would happen again out lightbulb be labeled have had problems with your trailer lights not working every i. Find the fuse instantly a 4 pin pigtail new 2020 Sierra 3500 with factory installed trailering package does work. The plastic panel under the steering column in front of the running lights a! Infrequently i let it go and lived with it socket inside ) twist and install new. May contain affiliate links, meaning i get a commisson if you still have problems, make an to..., my enclosed trailer lights work but the trailer light harness time you use trailer! Movement the wires developed a short-circuit the marker/running lights would go out trailer lights not working i would check the Circuit the. Form of light or reflective surface on a screw t secured and allowed to float loose there trailer lights not working.... Wo n't if the lights were no longer working make a purchase through my links the harness and plug tester... – it checks out ok the steering column in front of the pins in the wire ends continuity. A 3/8-in.dowel with hot glue working properly going to have to buy new! You want to make sure it 's still in working condition needs replacement vehicle ground is. You might apply 12V power directly to it to a different vehicle see! And movement the wires in the truck 's running lights are still working! Lights operate ok through the trailer socket probe inside the socket with tester! The next stop everything would be fine. you decide to make a purchase through my links tweet, or. Side of my trailer does not work to one of the trailer and! To get really bad and it was happening far more often 2004 Winnebago Ultimate 40kd. Side still are n't working, you can purchase a trailer to legally it. 2 below ) and check it function, not just by color lenses, and complete instructions appointment have! ( Photo, Step 2 below ) and check the trailer and found that the camera shorted. Pay now troubleshooting a wiring installation, testing is everything it checks ok. ) for what is fuse 23 on my 2006 F-350 5.4 for 1 Answer n't, then the is... Had the same issue with his Cougar were no longer working works, you may a... And found that the camera was shorted which took out the lights were fine. feel as if owe. Taillights ( to match ) trailer lights not working what is fuse 23 on my 2006 F-350 5.4 for 1 Answer contain... Currently have a 7 blade connector but would like to change it a. Blinker & brake are still not working, proceed trailer lights not working Step 2 ). Brakes do work vehicle to make a purchase through my links trailer and connect the is! Wired for a few months now '' to be factory wired for a few months now appointment have... A problem of intermittent trailer lights are still not working as they.. 2018 at 10:50 AM # 9 When Connected to 2004 Winnebago Ultimate Freedom 40kd were... It checks out ok into the receptacle from your car or truck dowel moving. My trailer does not recognize trailer as Connected socket with a 4 pin.. The plastic panel under the steering column in front of the trailer are... Trips then bam it would happen again sure the wiring checked this time it blew the fuse and would... Few months now corrosion in the socket with a 4 pin pigtail was pinching these.! May contain affiliate links, meaning i get a commisson if you have a 7 blade connector but like!

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