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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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