Posted by LJD on November 09, 2011 at 14:36:48 from (67.142.130.38):
In Reply to: Battery Question posted by Doug Kieta on November 09, 2011 at 03:43:19:
The generator has residual magnetism in the field coils. It stays there (usually) unless that generator gets pulled apart and the armature gets removed. The armature serves as a "keeper" for that slight magnetic field. When you polarize, it's usually done for one or two reasons. To correct a magnetic field that is the wrong polarity, or to restore one that is no longer there.
Same goes for magneto magnets. They stay charged almost forever when a magneto is all together. Take one apart though, and remove the magnet from the case, and it will go dead unless you stick a "keeper" on it. Any chunk of metal will do.
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