stupid breakaway cable wiring...
I have been perplexed which is easy to do since I'm not an electrician but try to do things safely. I have wired up the breakaway switch as the diagram here suggests. I have crimped a ring termina...
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The brakes don't hum with the breakaway switch in use. You should hear a click, and you should be able to rock the trailer slightly and then the brake shoes should lock up as the rolling action of the drum against the magnet wedges them into the tight position. The hum is from the brake controller modulating the voltage to the brake magnets.
