Always remember, there must be some form of light or reflective surface on a trailer to legally pull it. There are two approaches to troubleshooting. The first approach is based on knowing what is wrong. Some blown-out bulbs will be obviously defective—they’ll be clouded over inside with grey, white, or black residue. Check the necessary things. Notice the reflector replaced at the same time is also missing. checked harness on my truck its ok getting 12volts from brown wire. checked for ground it was ok. I just put new trailer lights on my boat trailer and all the lights work and the blinkers work, but when the headlights are on and you hit the brakes the tail lights go out till you let off the brake. Since it is still dark, their trailer tail lights must be visible, especially under water. Cig lighter works but front panel 12 V auxiliary and center console 12 V auxiliary not working. However, based on your description of the problem - all trailer lights working until you turn on the vehicle headlights - there is one most-likely cause that should be easy to correct. Also, my 12 V auxiliary power point is not working. 6% off. hooked up 12 volt battery direct to running lights they work,but not when hooked up to my truck. I installed a new Optronics low profile light on the left side and I still have the same problem. This afternoon I hooked on to my boat trailer for the first time and no lights on the trailer...tried a test light on the back of the truck, nothing on both plug ins…..no the fuses are burned! More blinkety-blink LEDs. These traditional lights become hot and when cooler water hits them, it can result in a failure. Left turn, right turn, and brake lights all work. Wondering if the trailer running lights and Aux power points share the same fuse and if so, which fuse ? Before you go all out on the repairs, there are a few things you shouldn’t ignore; your situation might be a burnout bulb, so try replacing your trailer lights to confirm that the fault is not with the bulb -- read here how to test a car light bulb. Each electronic of your car has a connection to its wick. Has this been an issue with anyone else....first time hooking to a trailer, 2500 miles on truck! Link to post Share on other sites. $31.99 $ 31. Similarly, the blown-out fuse might be another cause for tail lights not working, and brake lights are. This will prevent rust and get a better contact. Trailer Turn Signals and Brake Lights Not Working on a Boat Trailer. 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. Went to move the trailer when it was dark and all of the lights worked. The brake and turn signals are combined on a trailer, so it would be odd if it was just the brake light giving you issues. Thanks for reading GH Quote; Share this post. This burnt-out bulb does not affect the circuitry of the light system and it continues to function normally. My trailer lights on my boat trailer are not working? Once a year, take the lens off your traditional lights and use a bit of Vaseline or light grease on the bulb bases. You may have to remove the cover of the tail light. 3. Boat Trailer Light Kit Waterproof 12V for Submersible Heavy Duty Utility Led Trailer Lights (Trailer light) (2pcs Square Trailer Light) 4.4 out of 5 stars 343. Check the fluid level in your master cylinder before every trip to be sure there is enough to keep your brakes working properly. Restoring the ground connection should fix the situation if all lights are not working. 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