ASSUMING the charging system has been working properly, at each and every engine shutdown, the cutout relay disconnects the generator from the battery.
There's no longer any connection between the generator output and the battery.
So it makes no difference, whatever, if you change out the batteries at this point, because they are not connected to the generator, anyhow.
As long as the battery(s) is reinstalled/replaced with the same polarity as before, the generator isn't affected.
On the other hand, if the battery(s) is reconnected with the opposite polarity nothing happens until engine startup, when the generator begins to charge and the cutout is pulled "closed" connecting the generator and battery(s) together "fighting" each other.
The battery(s) will win, and expensive smoke will be lost from the generator and/or the regulator.
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Today's Featured Article - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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