Usually with KT controller if it has 3 wire brake connector & want to use a two wire brake sensor the v+ is not used and only v- & signal is needed .
So the Black and blue may on your controller is most likely the brake wire hence why there are only 2 pin red julet for the brakes.
So the Black and blue may on your controller is most likely the brake wire hence why there are only 2 pin red julet for the brakes.