Troubleshooting 4-Way Trailer Wiring Kit Install that Doesn't Work Vehicle On

Updated 09/30/2025 | Published 09/28/2025

Question:

I have a twenty twenty jeep grand cherokee.Without the original tow package. I ordered this kit so that I could install it behind the taillights, and then just run the power wire. After installing it and with the vehicle off, I tested all functions.And it worked. But when I turned the car on and began to test those functions, it did not work.. what am I not seeing here?

asked by: Anthony

Expert Reply:

Hey Anthony, how did you test the 4-way? Did you use a trailer or did you use a circuit tester? If a trailer I would check to see how the grounds are on the trailer as well as the pins of the 4-way as this could be a dirty pin that needs sandpaper to clean it.

expert reply by: Jameson C