I believe the early chore horses would sense the voltage and charge accordingly. I seem to recall one of the early manuals where it showed charging various voltages and combinations of batteries. I cannot speak for the later versions of the chorehorses. I believe there was some modification to the earlier ones to bring them up to the later standards. It wasn't that many years ago we could buy the 24V ones new/rebuilt with the lend lease decals visible underneath the newer semi gloss olive.
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