There are some vehicles that have this or a similar issue called a low-side switching system and you cannot tap into the brake switch wiring when installing a brake controller because of it. If you do not have a wire on the brake switch that shows 12 volts of power only when the brake pedal is pressed then you will need to get a dedicated brake light signal elsewhere. Typical places are:
The CHMSL fuse, if it is the only function on the fuse. Use the owners manual to find its location.
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