Troubleshooting Trailer Running Lights Not Functioning on a 2014 Nissan Frontier

Question:

i bought the wiring harness and hooked up to the gray plug by spare tire everything works but my tail lights and when turn on left turn signal both turn signals blink but turn on right and it works fine do i nedd the relays also and if so where do they plug i have a 2014 nissan frontier thanks

asked by: Brad

Expert Reply:

It sounds like the problem might be the wiring of your trailer, but to test this first you want to use a circuit tester like part # PTW2993 to test the pins of the 4-way on the # C56225 for voltage when the correct taillight function is applied. I attached a video that shows exactly how to do this. If the voltage is in all the correct places the problem is the trailer. If not, then it's the wiring of your 2014 Nissan Frontier.

If it's the trailer you will want to inspect the connector first for corrosion or shorted wires and fix as necessary working your way back from the connector to the light assemblies. The problem could also be ground related. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer frame or if the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt the ground. Running jumper wires from the light grounds to the main trailer connector ground can help.

If you are missing the running light circuit relay you will need one of the blue relays from the Curt Relay Kit # C57000. This product installs under the dash to the left of the steering column next to the brake controller connection point.

expert reply by: Jameson C