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

Question

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

0

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

0

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.

See All (5) Replies to Joseph B. ∨

Answer 1

The harness that is used to install a brake controller like the Tekonsha P3 #90885, like the #3015-P that you're currently using, is going to be vehicle specific and not trailer specific. The #3015-P is the correct harness for your 2003 GMC…

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Answer 2

It sounds like the red wire in the wiring harness #C51352 was not in the correct place. Take a look at the picture I have included and make sure that the wires in your harness are in the same places. This is the end that plugs into the truck. It…

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Answer 3

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Answer 4

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 5

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 6

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Answer 7

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 8

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 9

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Answer 10

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 11

Yes, it will work. You'll just need to cut the Lance 6-pin connector out and rewire it into the etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector item #e99011. Here are the individual functions of that Lance 6-pin:…

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Answer 12

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

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