1942 B FARMALL 12v or 6v neg or pos ground

The Bs when new were pos ground and 6v with a cut-out mounted on the generator. There is no real reason to go to 12v as they had a magneto ant didnot need any voltage from a battery when they ran only needed a battery to turn the starter. The bottom line do you want to keep them original. The 6v will start them below zero when things are in original form.
 

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