Posted by wore out on May 05, 2020 at 21:24:10 from (64.255.159.199):
In Reply to: Rebuilt Generator posted by super99 on May 05, 2020 at 20:01:45:
Quoting Removed, click Modern View to see
ASSUMING the rebuilder tested it on a test stand with it correctly connected (+) ground it was already polarized when you got it, and correctly.
Likely, it could have laid on a shelf for 20 years before you installed it it would have still charged, as well.
Where people get into trouble is if the generator was run/tested with the wrong polarity or POSSIBLY taken apart, put back together and NOT tested.
In such a case, if it charges "backward" at startup it can destroy the cutout relay points when they close, or weld them shut, which will discharge the battery through the generator and let the smoke out.
It never HURTS to polarize, as long as it's done correctly for the type of generator you are working with (either an "A" or a "B" circuit), but it must be done BEFORE the first startup with the replaced generator to keep all the $$$ smoke where it's supposed to be.
Another "myth" is that the generator needs to be polarized any time the battery has been disconnected or a new battery installed.
So long as the generator was charging BEFORE the battery was disconnected or changed it will charge correctly afterwards so long as the battery is connected with the same polarity as it was before.
Another old tale is that a hard drop of the generator or hammering on it can screw up it's residual magnetism, LIKELY true, but I don't know for sure.
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