Paul describes the brakes that were on my '84 GMC. It was a Kelsey Hayes controller.
One wire with circuit breaker from battery positive. One wire to brakes. One wire for brake lights. (I didn't use this, just tied the trailer brakes to the truck system and used a heavy duty flasher. Never had any problems).
You can probably figure out which wires do what on the controller with an ohm meter. the path to the brake lights will just be off or on with almost no resistance when on, the path for the brake shoes will vary in resistance depending on how far the lever on the controller moves, if its like mine.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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