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"Ivory 912" (sorry, but I always like to see a real name),
When a generator is left alone for a longer period without the load of a battery, so it doesn't 'see' a voltage with the correct polarity, it looses its residual magnetism in the iron field poles of the generator. This magnetic field is related to the polarity of the generator output. A short current pulse from the battery to the generator generates a new field with the correct polarity. After this magnetic field is 're-installed' in the generator poles, it will stay there for a long time. Again, just short pulse is enough! See other posts here on the board for the correct procedure.
I have some experience with these generators, but had never to polarize one - even not after not running an engine, followed by a rebuild, for several years
BTW, did you check and clean the generators collector and brushes?
Otto
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