That is s "NON OEM" generator, and COULD be a "B" circuit unit, which requires an ENTIRELY DIFFERENT polarizing procedure!!!! Using the wrong procedure will "let the smoke out" of the regulator and/or generator.
If you are not SURE as to what you have, and it has been working satisfatorly (-) ground, I'd leave well enough alone!
After all, the generator is NOT "correct", so why does the polarity have to be "correct"? (The ignition system will effectively be a little "hotter" with the correct polarity, but apparently it has been satisfactory as-is?)
If you still want to muck with it, are there any labels and part numbers on the regualtor?
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