How do I Tell if the Brake Controller is Bad
Updated 08/26/2025 | Published 06/25/2009
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Question:
Should I get a continuous 12 volts from the blue wire lead in the back of the truck or should it only read 12 volts when I press either the brake pedal or the brake switch/slider on the brake controller. If I am getting 12 volts all the time is this a sign that the controller is no good.
asked by: James R
Expert Reply:
You are correct, you should only be getting output when the brake is applied, or the override switch is activated. It sounds like the controller might be bad, but to make sure, you should probably bench test it before tossing it. Use a circuit tester, and check the red wire that exits the rear of the controller. This wire should only go hot when the brake pedal is pressed. If this checks out ok, then the controller is bad and must be replaced. We have a video that shows how to bench test a brake controller, I'll give you a link to the video below.
If you find that you need to replace the controller, I'd recommend the Tekonsha Prodigy P2, part # 90885. The P2 is a proportional controller for safer, more predictable braking. The P2 is very highly rated because of how easy it is to use.
Duane L.
4/11/2024
I have a 2021 Colorado with 3.6 cy, towing package. I do not have any voltage on F24 in the under hood fuse block that is supposed to be the positive for a brake controller. Even with the fuse out. Does the 2021 have to be programmed to power the fuse block?
Mike L.
4/18/2024
Jose P.
7/8/2024
Hi Mike. I have a 2017 ram 2500 that factory brake controller might stop working my question is if a replace the module and toggle switch. Do I need to get the computer reprogrammed for the new controller. Thanks
Mike L.
7/10/2024
Cody S.
10/10/2024
Mike, I have a REESE Towpower 8507111 Brakeman IV Digital Brake Control, it is hooked up to the factory wire harness in my 2011 Silverado 1500, I’m having an issue where I have 12v power on the red trailer signal wire. What could be the cause? With power on that wire it keeps the trailer brakes engaged at all times.
Richard P.
8/16/2025
I am having an issue when i apply the brakes on my truck it seems to be popping a 15a fuse which in-turn controls the running lights on the truck. This is an 03 F250 with the factory wiring harness for the trailer with a tekonsha voyager brake controller. I am hoping this is just the controller gone bad. i have looked at all the wiring and does not appear to be cut, chewed, sliced, etc...
Mike L.
8/26/2025
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