I had a somewhat similar problem with my Super H only it ran better with the lights ON. Quick solution was to run with the lights on. However when I shut the tractor down the lights stayed lit despite the light knob being set to OFF(!)
Problem turned out to be inside the ammeter box. The supply wire from the regulator L terminal to the ignition switch's hot terminal was rubbing the (uninsulated) light switch dimmer coil.
Using the lights on dim had apparently caused the dimmer coil to heat up and burn through the supply wire insulation and it shorted to the dimmer coil. This caused the lights to burn even with the light switch set at "O".
Replacing the shorted wire, then cleaning up wire routing inside the box to keep everything away from the dimmer coil solved the problem.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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