7>13. If you have a power converter or a T-connector, disconnect the trailer and use a circuit tester to check whether a signal is going into and back from the converter or Modulite box on the appropriate wires. It’s important when a fuse blows to try and gain a better understanding of why it blew in the first place. So we went back to the fuse box in order to try the new technique with the voltage tester. My trailer has a fold over sink/stove cabinet and when it is in its upright position it pushes down a push-button switch to enable the ceiling lights. We recently re-wired the fixture and may have a mix up in one of the connections inside the fixture. Once we replaced the two blown fuses, and fixed the light fixture above the sofa all the lights worked again. Tail light housings should be secured to a metal surface (trailer frame), not wood or plastic. Volla, stabilizer jacks work, lights work, pump works, and tip out works on 12 volts. As mentioned above, the check light of Dometic fridge would activate if it a problem occur within the gas system. Have you ever had issues with light fixtures in your RV? All the outlets and exterior lights work fine. The first thing we checked was that the switch was on. Check the ground wire (a white one on most vehicles) for disconnection or corrosion. Sometimes it’s even both. The main objective here was to see if the problem was with our light fixture or with our RV 12V lights. RV 12-Volt System Not Working: Troubleshooting. In order to get the 12-Volt system back online, we have to decide exactly what prevent it from working properly. So check the lights. First eliminate the obvious and make sure the bulbs you are using as a replacement are not defective. The problem is back. Most of the things in my trailer do not work now or I don’t know how to use them such as the gas oven, but I … If they don't, then the issue is with the trailer, not the truck. But check back in the future because we’re going to explain how we created the light fixtures. Any suggestions? We assume the lights in the hall and bathroom are running off of 12-volt, and that other lights in the RV are working fine. … Have a helper stand back to see if the running lights, stoplights and blinkers are working properly. MountainModernLife.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. If the fuse blows, the problem is on the truck. But it is possible that it is a ground issue. Remove the screws from the bulb lens (which you can access through the trunk or see your vehicle repair manual to get the exact location). Soon we realized it was a bigger problem than our light fixture. The first thing we noticed was all the other lights were working fine. We troubleshot our way through this problem by doing research and taking the approach that made the most sense to us. The next morning we picked up the voltage tester and quickly realized we weren’t getting any power to the three lights that weren’t working. Check the area the ground is secured to – it should be the bare metal frame. We found two blown fuses. Begin with checking the harness that goes into the fixture in question and move all the way back to the tow vehicle to find the point where the circuit breaks. Troubleshooting. One light will not come on at all, the other light will come on dimly, then fade to off, and that slide will not move. Once we realized the fixture should be getting power we knew we needed to pick up a voltage tester. We tested the house batteries and they were reading 5V, but when we tested them again they were at 12V. A poor ground often becomes the culprit when only some lighting functions are working and when lights go out when you push the brake pedal. 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. Built with quality and strength that will match that of your rig, our truck accessories are custom designed to enhance the appearance and function of your vehicle. If you find yourself unsure of something it’d be best to reach out to a professional or do further research.Â. All of the nonfunctioning lights are in the front of the trailer. Reasons Why This Can Happen 1. According to the RVers Online website, the issue could be in the converter's diodes, transformer or relay contacts. Jack and plug should be the only connection between a truck or SUV and a trailer. This means that using several functions at the same time creates the load that a weak ground can’t handle. We use cookies to give you the best possible experience on our website. We hope this information helped get you on the right track to fixing the problems with your RV 12v lights. The common causes the tail lights do not work are; Blow fuse – The first thing the mechanics check is the fuse corresponding to the rear lights. It is a wildwood lite with a Texas 2004 license plate on it parked in Mississippi. If the turn signals are not working, locate the fuse block that contains the circuit for them. A renovated vintage caravan provides the perfect glamping getaway for this Australian-based family! RH indicator works but LH one doesn’t. When it is sitting in the garage, you are losing time and money. Hook up your trailer and connect the trailer light harness. Use the circuit tester to see if current is going to the light fixture itself. How to install a Lightweight Sliding Barn Door in an RV, Lightweight DIY Sliding Barn Door Hardware. If the running lights are not working, one of the first things to check is the presence of a blown fuse. A poor ground often becomes the culprit when only some lighting functions are working and when lights go out when you push the brake pedal. Troubleshooting trailer lights can appear to be intricate, but a good visual inspection can take a great deal of problems off. Post by Dan All, I have a 1997 Coleman Santa Fe popup camper. For instance, the light fixture above our sofa has a switch near the steps, this is also where our 12v on/off switch is located. Andrew Demaree is Bully’s resident technical writer and automotive expert. Carol. The pilot light is responsible for triggering the fridge burners. Issue #1: The pilot light keeps burning out. Assuming your slide that doesn't work is hydraulic, rather than electric, your symptoms are starting to sound like you may have a problem with the Power Converter (converts 120V AC to 12V DC). However, the LED bulb would not turn on. Trailer tail lights not working? … Camper refrigerators are not like your fridge back home. Being SAE certified mechanic, Andrew knows how your vehicle works and how to make it run even smoother. Number plate lights not working. No matter what we tried we couldn’t get it to work. I've checked to make sure t … Luckily for us this time it was just because some wires had crossed. It was 7 pin with 13/7 pin adapters both ends. Katie and I are adding dimmers to a few of our custom made light fixtures. Indicators still not working. Quick question for the electrical experts. Stumped here please help. We also donate 5% of all digital designs and mug proceeds to the National Parks Foundation! Dimmers are going on the mason jar lights in the bedroom as well, so we took them down to try in the living room. Creating projects with our tutorials and supplies is at your own risk. If the output is going into the box without coming out at all or goes on the wrong wires, check the grounding location. The battery display shows the auxiliary batteries are low. Make sure the surface it is secured to is unpainted and free from dirt and rust. The right side light does not work – no brake light or turn signal. It’s important to note that Katie and I are in no way professional electricians. Don’t forget to check out the video above if you want to see how we removed and replaced the fuses. Because the most common reason for trailer lights not working properly is a bad or missing ground, check the trailer’s and truck’s ground connection first. Click hereto check out trailer testers. Disconnect the battery with your RV plugged into a power source. Downtime is money, and when your trailer lights are giving you troubles, your trailer is not road legal. Use the following general guidelines on trailer lights troubleshooting that will help you find and solve the issue and get your trailer back on the road with its lights performing exactly as expected. Like the video, there was a button, that when pushed, snapped in. This DIY Modular Desk is perfect for small spaces! Have a question, a mountain town recommendation or just wanna say hello? The solution to fixing our RV 12v lights was replacing the fuses. Some light fixtures within an RV can have switches located on a control panel. If all the lights appear dim or you have no lights at … When connected to my fuse box the regular original bulb works no problem so I know I have the wiring correct. Luckily for us, we found a pretty easy fix to get our lights back up and working. You may need to clean the brass terminals using steel wool or wire brush to restore a good connection. The brightness of the dash lights can be adjusted by turning the rheostat near the headlight switch, if this adjustment is turned "OFF" the dash lights will not work. Test all of the lights, from the backup lights to the turn signals and brake lights to ensure the problem is not the tow vehicle itself. The circuit breakers didn’t help, the 12v disconnect fuse was in good shape, and turning on the RV didn’t do much considering all the other RV 12v lights were working. Make sure that each of tail lights is properly grounded. If the bulbs are not the problem, disconnect the trailer's wiring system from the tow vehicle. Blown out light bulbs are the most common reason for why the brake lights not working but the tail lights are. Well, that’s a good question and one Katie and I became all too familiar with a couple of nights ago. Ground the tester and apply the probe to that contact while a helper turns on the truck lights. Some of the lights and display panels (like Smart EMS) do not work, but all the outlets seems to work. LH rear parking and LH front white light are working. We won’t go into detail on how we fixed that here. If all of the lights are connected on the same circuit and one of the fuses is blown, then the lights will not work. 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