The presence of a ballast resistor says someone converted your SM to 12 volts.
The 3 terminal regulator also suggests 12 volts. You might get lucky and find the regulator marked on the underside with voltage and polarity.
Keep in mind the original SM 6 volt regulator had 4 terminals. But 3 terminal, 6 volt regulators exist and when properly wired up will work on a Super M.
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You might try to get a part number off the generator nameplate then try to locate the matching regulator.
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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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