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 - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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