Troubleshooting Trailer Wiring on a 2005 Nissan Titan with Curt Relays Installed

Expert Reply:

On some Nissan vehicles there is an additional relay needed in the in-cab fuse panel inside the vehicle. You will need to consult the vehicle owners manual for all of the fuse and relay locations related to trailer wiring. The extra relay can be obtained at a Nissan dealer.

The first thing I would check though is for voltage on the trailer connector, this will tell you if the problem is on the trailer or vehicle side of the equation. Check out the video I attached that shows how this is done. You would want to use a circuit tester like our # 40376. If you find that there is voltage on the 4-way then you know the problem is on the trailer.

If the problem is on the truck side check to see if the fuse panel under the dash needs the additional relay. If the trailer has the problem you will need to trace the wiring back on the trailer looking for any issues like exposed wire or corrosion and fix as necessary.

expert reply by: Jameson C