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The power going to the controller is constant battery voltage, wired directly to the battery. The circuit breaker is momentary. It will only cut power if the circuit is overloaded and even then it will come back on after the circuit breaker closes again. This is how the instructions stated they wanted the circuit wired.
The blue wire is actually the trailer brake output from the controller. The voltage will vary depending on how much braking is required. You might remember in the video that I went through great pains to make sure I had a good ground at the white wire which is directly on the trucks frame.
The back up light connection was weak because it was wired in series with the reverse lights. Most trailers don’t have reverse lights. It would sometimes be used as a signal to turn OFF the trailer brakes when backing up to make parking a trailer easier. It’s more of a signal wire than it is for actual lighting.
Thank you for your comments.