I Installed the Standard Trailer Light Kit with 25' Wire Harness and Lights are Not Working

Updated 08/04/2025 | Published 07/28/2025

Question:

Lights don’t work after installation

asked by: Matt S

Expert Reply:

Hello Matt,

I am sorry to hear that you got the Standard Trailer Light Kit with 25' Wire Harness # TL29BK installed on your trailer and the lights are not working. It is hard to diagnose the problem without seeing the install. Can you pleases respond to the email you receiver with pictures of the whole install?

I attached an install video for you to check out, maybe watching it you will be able to see what needs to be fixed.

How did you test the lights? Just trying to figure out if it is trailer side or vehicle side.

expert reply by: Kate F

Matt S.

8/1/2025

Yeah, I can send a video or do you want it sent to? I installed everything I’ve cleaned all the ground points. I am getting proper voltage out of my truck plug still can’t get it figured out I’ve wasted 10+ hours trying to figure it out.

Kate F.

8/4/2025

@MattS The lights are installed through metal right? That is how they are grounded is through the stud. Can you send video and pictures? You can do so by just responding directly to the email that you receive. I am sorry, that would be extremely frustrating to work on something for that long, things would definitely be flying at my house if I was working on this.