Troubleshooting a Tekonsha Primus Brake Controller That Does Not Work When the Brakes are Pressed

Updated 05/23/2024 | Published 05/20/2024

Question:

Hello, I have a Tekonsha Primus controller and the brakes seems to work only with the slide switch not the brake pedal. Thank you.

asked by: Joseph B

Expert Reply:

Hey Joseph, so it sounds like there is an issue with the brake switch circuit which is what actually tells the brakes to activate. This should be a red wire coming out of the controller, and you're going to want to make sure that it is connected to a circuit that only sees power when the brakes are activated.

You might also have a blown fuse, so I'd recommend checking that as well.

I have attached a FAQ tht you can check out to help you troubleshoot a bit further.

expert reply by: Bryce D

Joseph B.

5/22/2024

Are you talking about the fuse on the tow vehicle?

Bryce D.

5/22/2024

@JosephB Yes.

Joseph B.

5/22/2024

@BryceD I forgot to mention that I hear the magnets working when pressing the brakes but it doesn't seem to stop the tires when I spin the wheels by hand being the tow dolly is on jack stands. Works fine with the slide switch.

Bryce D.

5/23/2024

@JosephB Ok, so if you hear the magnets engaging then the fuse isn't blown because power is still flowing.