Running Lights Not Working On Trailer

If the lights on the tester function properly the problem is the trailer lights or harness and you need to some trailer lights troubleshooting.

Running lights not working on trailer. Hi we bought a 2017 31 ft travel trailer last weekend and after hooking it up to our ford diesel all of the lights on the trailer worked. 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. If you are having a problem with your brakes on your trailer not lighting up while you re running lights are on here is a simple solution on how to fix that. 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.

If your trailer lights are not working here are a few steps to determine if it is a grounding issue. How to troubleshoot travel trailer running lights not working. If you have every thing working there then its a wiring problem on the trailer and you will have to find the problem and repair. Then there is no lights at all that work on the trailer.

Could i have messed up the harness. So the result is no running lights at all on the trailer side. I checked the trailer connection at the truck and my running lights are not working. I checked the running light pin on the truck plug and i do show it is getting power to it.

Clean both connector plugs. Only have tail lights for the trailer as long as the headlights are off on the truck. My blinkers work and brake lights. Step 2 trailer lights not working solution.

Trailer lights only right hand side turning light and brake light work running lights and left side brake and turning lights do not work. Any solutions check at the trailer connector on the truck.