Troubleshooting Right Running Lights Not Working On a Boat Trailer

Question:

Hello! I have run into a problem with my boat trailer where the turn signals and brake lights work for both lights, but the running light only works on the left light. I drive a 2015 f150 and have checked all fuses in my truck and also tested the 4-pin connector on a different set of lights and everything worked. I have tried to look everywhere but I can’t find anyone that has run into the same issue as me. Any help or advice would be greatly appreciated!

asked by: Tony P

Expert Reply:

You are going to want to check the lights on your trailer. If they are a bulb type the running light uses a separate filament inside the bulb which may have become damaged. You could also have a bad connector in the light itself. If you have LED lights it could be a connection issue inside the light or the diode for the running light itself is bad. You can use a Test Light # PTW2993 to test for power going into the tail light as this will tell you for sure if the power is getting to the lights. If not you may have a short in the running light wire to that light.

expert reply by: Bud M