Posted by Lee B on October 27, 2013 at 21:39:45 from (220.127.116.11):
In Reply to: Re: 48 JD A posted by 1949ABG on October 27, 2013 at 08:27:27:
As your old timer stated, it's not really needed even when you've been inside the generator to a limited extent. If done correctly it doesn't hurt a thing to do, but really only needed if it won't charge or is charging backwards. The field poles retain their magnetism quite well, but if you have to change them out then of course it's necessary before firing up the engine.
A good reason for having that advice in the books you've seen would be to insure a 100% match with the polarity of the ground system to the generator's output no matter what the ground system got accidentally changed to during the battery change out. These sorts of things do happen and it wouldn't be a good thing to charge the new battery backwards for any length of time. Tends to let the smoke get out of generators and it's real hard to get it back in there where it will all work right again.
Good all around advice to polarize the generator after you have changed out the battery. Even when it's not needed.
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