Troubleshooting Right Trailer Brake Always on with Curt Wiring on a 2006 Dodge Sprinter

Updated 04/15/2025 | Published 04/02/2025

Question:

I installed the nice powered control box on my sprinter van everything was going great but then I started using it and the right brake light stays on, like even when I am stopped. I had to pull the fuse to turn it off. The left still works running lights brake and turn so I checked to make sure I did not short any wires. Nothing then checked to make sure it was not in the trailer wires and nope then I rewired from the right side the light and it still stays on. Is this a blown box? Did I get a blown one?? I forgot to take photos and I had to wire up just brakes and running lights to get home. I will try to replicate when I am home.

asked by: Steve T

Expert Reply:

Hey Steve, thanks for reaching out and for your purchase of the Curt Wiring # C59236.

It's always possible that the black module box is faulty, but what I recommend doing is making sure the green wire is spliced to a circuit that only gets hot when the right turn signal is used. If you have a combined lighting system then it will need to get hot when the brake is used as well.

Then you can double check that on the output green wire from the module.

If everything looks fine going into the box, but then it messed up coming out of the box, the module is faulty and you'll want to look at a warranty.

Let me know what you find!

expert reply by: Jon G

Steve B.

4/12/2025

Ok I was driving when this happened. Then when I turned the auto off it stayed on. This draining the battery. So I tried to see if it was a wire thing . It was working perfectly for a day. Then it stayed on all the time even after I shut off power to the vehicle. I thought maybe it was a time thing so I walked away came back and it was still on. I was in transit so I did a quick bypass of the entire thing and took out the fuse to shut it off. Later I took it all out and when I checked it it was still doing it. So I guess I am in warranty? Now how do I do that. Thanks steve

Jon G.

4/14/2025

@SteveB Did you try using a circuit tester to make sure everything was connected to the correct circuits and the power going into the box was different than what was coming out of the box? I'll need you to test it like this before I can send in a ticket to our customer service team to reach out to you about a warranty since you purchased it through us.

Steve B.

4/14/2025

@JonG Yep all was wired correctly and had the appropriate voltage. Email me…

Jon G.

4/15/2025

@SteveB I just sent a note over to them - keep an eye out on an email or call from them!