I got a Nissan 2006 titan and the harness for the trailer works except for the running lights on any trailer.. is there a fuse SPECIFICALLY for the running lights on a harness? I dont know much about cars but thought the harness and normal vehicle lights would be on the same fuse, and the running lights would be a part of the fuse for everyone instead of having its own separate fuse.


any help is appreciated.

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This says 2017 Titan, but it circles the trailer running light fuse.

2) Hook a different vehicle to it and see if you get same.
3) Check for power at the plug. You can find wiring diagrams pretty easy for the plug itself

Sorry, I read 2016 Titan at first. That pic may not help.

I have a 2014 Titan, so not the same, but i had some issues the first time i hooked up a trailer. There are fuses/relays in a box in the engine bay near the bottom passenger-side corner of the windshield. Check the wiring on the back side of the connector in the hitch - I believe 1 pin had backed out on mine causing 1 turn indicator to fail. Check the wiring harness from there going toward the front of the truck - I've heard of issues where it goes across the axle and near the exhaust.

Check the different fuses and relays in these diagrams:
https://www.startmycar.com/nissan/titan/info/fusebox/2006


Edited to add: the trailer running lights come straight from the truck's taillights. If your truck's taillights work, then the problem is between the fuse box and the connector, or maybe in the trailer itself. I suspect the connector, or the wiring behind it under the back of the truck.

If you have a multimeter, or a simple test light, you can easily perform a couple of checks to help narrow it down. Put the key in the ignition and turn to the On position. Turn on the truck's lights.


1) Open the flap over the connector in the trailer hitch. Using a test light or multimeter, bridge the connections in the 7 o'clock position (white in the Vehicle Side part of the pic) and the 1 o'clock position (black in the pic). This will verify that you have voltage - I expect it to work since you say some of the trailer lighting works.

2) Bridge the 7 o'clock terminal with the 11 o'clock terminal (green) to see if the running lights terminal has voltage. I suspect this is failing. If you have voltage here, the problem is in the trailer's wiring or connector.

3) Unplug the wiring harness from the back of the trailer hitch connector and repeat the tests above. Terminals should be in the same positions. If the running lights work here but not on the other side, then the problem is with that socket in the hitch, which is not uncommon. If there's no voltage to the running lights terminal here, then the wiring or a fuse/relay has a problem.

Good luck and report back what you find out.