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Brake Controller Not Receiving Power


I have a brake controller tester I got from you many years ago and plan on buying parts from your company now that my existing stuff is aging. My trailer brakes are not working and the light is not coming on on my brake controller. The tester show the brake light on all the time. Has been working fine for years with multiple trailers. Any suggestions you could help me with? Thanks,


Expert Reply:

In order to determine the problem based upon the information you are receiving from a brake controller tester such as the Curt Trailer and Brake Controller Wiring Circuit Tester part # C51498, I would need to know the make and model of the tester you are using. If you can provide me with this information then I would be glad to help.

Although I cannot confirm the error message you are receiving from the brake controller tester, I can however offer my input as to the general cause of the problem for a brake controller not powering on.

In order to determine whether or not your brake controller is receiving power, you will need to use a circuit tester like part # 40376. When the ignition is on or in the accessory position, you will need to locate the 12 volt hot lead and test to ensure you are receiving power to the brake controller. If the light does not illuminate when connected, there can be three potential causes. 1) The fuse, if there is one, responsible for the brake controller is blown. 2) The power wire has become severed or frayed. 3) The brake controller is broken and will need to be replaced.

If the fuse is intact and the power wire is not severed, you will need a new brake controller. I recommend the Tekonsha Prodigy P3 Trailer Brake Controller part # 90195 as this is our best selling controller and is also very reasonably priced.

expert reply by:
Conner L

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