Why Do My Trailer Lights Stay On With The Vehicle Off? Curt T-Connector C44ER

Updated 09/30/2026 | Published 09/28/2026

Question:

hi, my trailer lights stay on even after the vehicle is off. i followed video instructions and installed it in the exact same place on the video, directly to the battery. Im sure i did something wrong. please help. THANKS.

asked by: Ron S

Expert Reply:

Hey Ron, thanks for reaching out. Connecting the Curt # C44ER directly to the positive battery terminal is correct, so you did not mess up that part. The converter is designed to have constant 12V power from the battery through the included 10-amp fuse; it turns the trailer-light circuits on and off based on the signals coming from the vehicle.

If the trailer lights stay on after the Rogue is completely shut down, I recommend checking the white ground wire first and making sure it has a clean, solid connection to the vehicle body. Then unplug the trailer and test the 4-way itself; if one or more pins stay powered after the vehicle has fully gone to sleep, the converter may be receiving a lingering vehicle signal or the converter box itself may have failed internally. The converter boxes failing is rare but not unheard of. If that is the case, we will have to get you a new one.

Give that a try and let me know how it goes.

What kind of trailer are you hauling?

expert reply by: Jesse M

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
(click to enlarge)

Ron S.

9/29/2026

Hey thx for getting back quickly.... Just a golf cart trailer.... 5x9. I'll try that ASAP and get back to you. Thx!

Jesse M.

9/29/2026

@RonS Nice! Sounds good. You know where to find me if you need anything!

9/30/2026

I had the same issue with my first purchase. Everything worked perfectly. I picked up the U-Haul trailer and even if the Rogue was off and lights were off the trailer lights were on. Their was an issue with the trailer lights, it wasn't anything I did or anything wrong with the harness. I hooked up to my buddy's trailer when I got home from my trip and it was fine. I ended up trading the 2021 for a 2023 , my wife likes her rogue. I bought another trailer hitch and harness and never had the issue again.