We had the same problem for over 1000 miles. Ding Ding Ding. Trailer wires disconnected. But everything worked everytime I checked. It turned out to be a wire inside out brake drum. We replaced the drums. The next year the exact same thing happened again. I ended up putting wire ties on the internal brake arm to hold the wires out of the way. It worked.
Then I replaced everything with IS and hydraulic disc brakes.
The attached photo is my wire as found originally.
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