Troubleshooting Right Blinker Taillight of # TLL9RK Not Functioning on Trailer

Question:

Installed new led lights, wiring on trailer. The lights work in reverse of blinkers on vehicle. I installed new tow wires on my 2008 Mazda Tribute. Everything works great on vehicle per tester I purchased. I tried to simply switch wires / lights on trailer to match vehile blinkers. Now driver side left works but the right trailer light does not blink. Everything else lights up ok?

asked by: Robert S

Expert Reply:

When a single trailer taillight doesn't want to function the issue is almost always related to the ground of the assembly. What you'd want to do is check the condition of the ground and fix as needed. If you have the # TLL9RK kit that you referenced it grounds through the white wire of the assemblies that normally get ran to the trailer frame. What you can do is run that white wire either all the way back to the main ground of the trailer wiring harness or find a better place to install it on the trailer frame.

expert reply by: Jameson C