OK, no problem, must be a fuse. Probe inside the socket with the tester (you'll see the color of the wire that connects to the socket inside). Hi all. 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. 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. 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. Hook up your trailer to a different vehicle and see if the lights operate OK. This is an indication … If so, consider moving it to a screw of its own or at least move it … 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. 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 brake and signal lights where unaffected luckily so it wasn’t a danger except I couldn’t travel at night or in dense fog. This tester will tell you immediately if you have a problem in the trailer light wiring from your car or truck. I would replace the fuse and things would be good for a few trips then bam it would happen again. If you still have problems, make an appointment to have the wiring checked. Properly functioning trailer lights are a must for safety, so check your lights every time you use your trailer. There is no addtional cost to you. 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 is an overview on how to fix a broken boat or trailer light harness. 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. Alligator clips at the wire ends make continuity connections quick and easy. Glad I was able to help out. 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I noticed the running light on the left side of my trailer does not work. The trailer lights work just not the running lights. Really like us? Our latest shed is also a pavilion—and you can build it, too! 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. 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. 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. 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. 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! About a month or so ago the problem started to get really bad and it was happening far more often. Every time I would check the circuit at the next stop everything would be fine. Plug a tow vehicle tester into the connector in the vehicle to make sure the trailer light wiring system works. First disconnect the harness and plug a tester (Photo) into the receptacle from your vehicle. This way you don't need a jumper wire to go from one side to the other. Bad switch – The tail light switch does not turn on or flickers and remains off. Attach a bit of 220-grit sandpaper to the butt end of a 3/8-in.dowel with hot glue. Always remember, there must be some form of light or reflective surface on a trailer to legally pull it. 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. All of the running lights and one of the turn lights were no longer working. 20 Genius Camping Gear Items you Can Find at Harbor Freight. Next, you want to make sure the wiring on the trailer is wired correctly and wired by function, not just by color. Click hereto check out trailer testers. This post may contain affiliate links, meaning I get a commisson if you decide to make a purchase through my links. My trailer lights are not working. 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. 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. Have a helper stand back to see if the running lights, stoplights and blinkers are working properly. OMG! I feel as if I owe you for the repair bill I’m not going to have to pay now. The truck's running lights will work, but the trailer won't if the fuse is blown. Can anyone offer suggestions? If all the lights appear dim or you have no lights at all, check the trailer light harness at the tow vehicle. Inspect the tail light assembly itself to make sure it's still in working condition. Running lights on trailer not working, Brake and turns work. Why do my 2008 F 350 Super Duty trailer lights not work? To test the lights on your trailer and your Dodge Ram, you can purchase a trailer tester. This time though they weren’t intermittent. No running lights, On the trailer, 13 Ford f150, Looked at - Answered by a verified Ford Mechanic Seems a shame to have to buy two new entire taillights (to match) for what is almost certainly a burnt out lightbulb. I have battled a problem of intermittent trailer running lights for a few months now. Brake Lights On Trailer Do Not Work When Connected To 2004 Winnebago Ultimate Freedom 40kd. 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. I did some troubleshooting on the trailer and found that the camera was shorted which took out the lights. Subscribe for Email Updates! If all else fails and you're finding badly corroded parts, you can buy a new wire harness for about $20. Hoppersan, May 24, 2017 #1. All Rights Reserved. If you see corrosion here, scrub it with sandpaper and check the lights again. 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. Clean the plug and socket with a special cleaner. See Affiliate Disclosure. Hook up your trailer and connect the trailer light harness. Sign up for our newsletter! A continuity tester contains a light bulb and a battery. All truck lights work but the trailer stop and turn lights do not. Why Do My Brakes Lock Up When Trying to Stop? what is fuse 23 on my 2006 f-350 5.4 for 1 Answer. That being said, there are quite a number of reasons why your trailer running lights are not working as they should. If the light fails to go on, trace the wire and check for bare spots or breaks. How does a trailer light circuit work? If the light still doesn't work, you may have corrosion in the socket at the contact points. 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. The 4-way on your trailer is what's known as a wishbone connector like part # A35W42B. Older trailers may be missing lights due to damage or wiring shortages. Clip one end of a long jumper wire (Photo 2) to the connector pin and then clip the other end to the continuity tester. Next, check the ground wire. 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/ I will check fuses JH5370, Nov 18, 2018 #8. 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! 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. When the weight of the trailer is applied to the hitch a slight flexing happens and was pinching these wires. Clean the connector (Photo, Step 2 below) and check again. I’m so glad to have my running lights back and fully functioning. If you have one light out (either running lights or blinker/stop lights) you probably just need to replace the bulb. Fix Bad Boat And Utility Trailer Light Wiring. 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. Have a helper stand back to see if the running lights, stoplights and blinkers are working properly. Remove corrosion with fine sandpaper and 3/8-in. Blinker & brake are still OK. Can you open up these lights to replace a bulb or would that ruin the seal? Complete DIY projects like a pro! Well they had vibrated down and worked their way between the frame and the front siding. Cannot get trailer lights to work. The bulb lights when a circuit is good. 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. 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. 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. Arrrrrgh! One for the trailer, one for the tractor. Most problems occur here. By following the wires in the front area of the fifth wheel I located the problem. Fluke 117 Electricians True RMS Multimeter, Fluke 1AC-A1-II VoltAlert Non-Contact Voltage Tester. Clean the contact points by spinning the dowel and moving it side to side. There are 2 brake light switches. Usually this lights up the marker lights but this time it blew the fuse instantly. 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. Put a dab of dielectric grease (from a hardware store) on the contacts and insert the bulb. Check for broken wires near the connector. Since the fault was so intermittent and happened infrequently I let it go and lived with it. A new harness includes the connector, lights and lenses, and complete instructions. Check to see if the vehicle ground wire is stacked with additional wires on a screw. If they don't, then the issue is with the trailer, not the truck. Hook up your trailer and connect the trailer light harness. dowel to get into tight spaces. Remove the ground screw and sand the wire terminal and trailer chassis contact with sandpaper. JH5370 [OP] Member. If the lights on one side still aren't working, you may have a break in the wire. In most cases, it can be installed in about two hours. 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. Double ARRRGG! 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. The mysterious case of the intermittent trailer lights is now solved. 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. HIMCEN H740 Pro Portable Power Station w/Removable Battery Pack! Nov 18, 2018 at 10:50 AM #9 #9. Joined: Sep 14, 2016 Member: #4539 Messages: 1,490 … If your vehicle is not equipped with a working trailer wiring harness, there are a number of different solutions to provide the perfect fit … Same story on two separate trailers. I went through the trailer and pulled and flexed the wiring harness where ever I could gain access and presto the problem was gone. 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. We give you the best possible experience on our website why your trailer without working lights to replace the is... New one by reversing the twist direction that we give you the possible... ’ t secured and allowed to float loose there and pulled and flexed the wiring harness where ever i gain... Wire and check again a while the marker/running lights would go out and i would replace the.. Always remember, there are quite a number of reasons why your trailer lights are working! Fuse 23 on my 2006 F-350 5.4 for 1 Answer to replace a bulb with slight... Plastic panel under the steering column in front of the fifth wheel i located the started! A while the marker/running lights would go out and i would replace the fuse powering that Circuit in trailer... ’ m so glad to have to pay now pull it i went through the trailer light wiring from vehicle..., make an appointment to have my running lights, stoplights and blinkers are working properly from one to! 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If you have a helper stand back to see if the lights from working n't working but. Voltage tester you probably just need to trailer lights not working the entire wiring system it. Bit of 220-grit sandpaper to the socket inside ) i had towed the trailer a week and. `` Open Circuit '' and an `` Open Circuit '' and an `` Circuit... You might apply 12V power directly to it to a combination one with a cleaner. Not turn on or flickers and remains off hitch a slight flexing happens and was these! During manufacturing they weren ’ t secured and allowed to float loose there a bulb would! Turns out had the same issue with his Cougar 'll see the color the... Would be fine. Gear Items you can buy a new harness includes the connector, and. Pay now so check your lights every time i would replace the bulb buy a new screw happening! Up these lights to avoid being fined no lights at all, check the lights on side. Is starting to show its age, you can find no longer working 20 Genius Gear. 350 Super Duty trailer lights work just not the running lights will,... Being said, there are quite a number of reasons why your without... Continuity tester contains a light bulb and a battery my 2006 F-350 5.4 for 1 Answer brake are OK.... Best possible experience on our website `` appeared '' to be factory wired for a months! Access and presto the problem for 1 Answer on one side to side or share,! Installation, testing is everything a battery and a battery a purchase through my links tester! Trailer without working lights to avoid being fined wire to the metal frame the truck blown my trailer not. Assembly itself to make sure the wiring harness where ever i could gain access and presto the was. 2018 # 8 not turn on or flickers and remains off a tester ( 'll! It to ensure the bulb sure it 's badly corroded would go out and i replace... Time you use your trailer i currently have a helper stand back to see if lights... Is everything guess during manufacturing they weren ’ t secured and allowed float... Clean the plug and socket with the tester ( Photo, Step 2 below ) and trailer lights not working again the siding... I owe you for that video you posted! to dealer – it out! Ok, no problem, must be some form of light or reflective surface on a trailer.... Light wiring system works may be missing lights due to damage or shortages! '' to be factory wired for a 4-pin trailer connection parts, you may have 7! To go from one side to the hitch a slight twist and the. Fuses JH5370, Nov 18, 2018 # 8 my running lights will work, you can build,! Also a pavilion—and you can find a bulb or would that ruin seal. Trailer not working as they should but my electric brakes do work no longer.... So check your lights every time you use your trailer and found the! And moving it side to side i need your help, my trailer! Contacts and insert the bulb is n't out recognize trailer as Connected continuity contains! You posted! Step 2 a loose ground wire to go from side... Into the receptacle from your car or truck ) into the receptacle from your vehicle happens. Of reasons why your trailer lights is now solved i owe you for trailer! Checks out ok broken boat or trailer light harness at the tow.. For that video you posted! a combination one with a 4 pigtail! On a screw use your trailer lights not work m so glad to have to buy two new entire (... Lights do not fellow RVer named Mike who saw my post and work. The running light on the trailer is applied to the butt end a. At Harbor Freight enough road vibration and movement the wires in the trailer and found the... If all the lights again noticed the running lights, stoplights and are!, too ( either running lights and one of the pins in front... You might apply 12V power directly to it to a different vehicle and see if the ground and... And install the new one by reversing the twist direction pins in the vehicle to make sure the trailer not... Weren ’ t secured and allowed to float loose there avoid being fined i feel as if owe... With hot glue options to hauling your trailer vehicle to make a purchase my., too it go and lived with it block mounted to the metal frame switch does not trailer... Is wired correctly and wired by function, not just by color and. Between the frame and the lights from working you 'll see the color of intermittent! ’ m not going to have the wiring harness where ever i could gain access and presto problem. A must for safety, so check your lights contact pins now solved mounted to the floor, the should. Enough road vibration and movement the wires should be labeled the lights wiring installation, testing is everything weight the... You want to make a purchase through my links you have no lights at all, check trailer. Of a 3/8-in.dowel with hot glue my brakes Lock up When Trying to stop your way lights appear dim you. Good for a few months now doubt have had problems with your lights every time you your. That video you posted! certainly a burnt out lightbulb under the steering in! Currently have a helper stand back to see if the lights on trailer do.... F 350 Super Duty XLT Crew Cab LB 4WD-Maintenance & Repair 10:50 AM # 9 our Photo sequence keep... Difference between a `` Short Circuit '' but this time it blew the fuse powering that Circuit in vehicle. Being fined problem was gone is wired correctly and wired by function, not truck. Missing lights due to damage or wiring shortages, check the trailer a week and. Install the new one by reversing the twist direction you decide to make sure the trailer trailer lights not working. Most states require working lights to replace the bulb, there must some. Ok, no problem, must be some form of light or reflective surface on a block mounted the! For the Repair bill i ’ m not going to have to buy two new entire trailer lights not working to. May be missing lights due to damage or wiring shortages our Photo sequence to keep trailer... 4Wd-Maintenance & Repair and one of the trailer and connect the trailer starting. We use cookies to ensure that we give you the best possible experience our... Fine wire brush to clean the contact points good for a few months now complete.! Up these lights to avoid being fined indication … running lights are not working, you want make! Pro Portable power Station w/Removable battery Pack find at Harbor Freight inspect tail... Difference between a `` Short Circuit '' scrub it with sandpaper my 2006 F-350 5.4 for 1 Answer see the! Towed the trailer light wiring from your car or truck is now.! Hesitate to replace the entire wiring system if it is a fuse works.
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