When I was a kid some of the 6 volt farm tractors were upgrade with 8 volt batteries to spin them over quicker.
Have converted a WD45 Allis Chalmers over to 12 volt using the original 6 volt starter, and for the Generator we used the GM single post Alternator, changed the light bulbs to 12 volt and it was good to go.
Just like pictured here with the GM Alternator, was a common thing to do.
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Cranked over real nice with that 12 volt power.
