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I own a 1948 JOHN DEERe B so I know for a fact that B's serial number 201000 and up have positive ground. Don't reverse the polarity cause it'll fry the generator and possibly the starter (the starter might even turn backwards - not sure cause I've always been sure to connect the batter with positive ground).

The older B's should most likely be the same as 201000 and up. My dad told me that a lot of old vehicles from the 40's had positive ground. Not sure why though.

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Q: Does a John Deere B have reverse polarity?
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