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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