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Will Trailer Brakes Lock Up when Connected to 2003 BMW X3 that Does Not have a Brake Controller

Question:

Hi. I just bought a trailer it has electric brakes. I have an BMW X5. It has the 7 way connector and so does the trailer. However i do not have a brake controller in the car. I have to go pick up the trailer but my question is without a break controller will the brakes lock up on the trailer? Or will they not work at all? I ask because i would rather not have them lock up on me . Please let me know. Thankyou.

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Expert Reply:

The brakes on the trailer will not lock up. they actually won't do anything at all (unless something was miswired). To activate the brakes you would need to have a brake controller. Without one the brakes will not function.

Because of how the wiring works on a BMW the recommend brake controller for the 2003 X5 with factory 7-Way is actually the Prodigy RF # TK94FR which mounts to the trailer. If you do want the brakes to function in the future, which I do recommend as it will be much safer and produce less wear and tear on the vehicle, then the Prodigy RF is the controller for you.

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