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while there are 6v'ers that will start in cold temps,
they are the exception, rather than the rule.
Most of mine get 12v, the few 6v ones I have start in warm weather fine........cold, I don't bother trying.
That, "make sure everything is right, hold your breath, don't mess up the fire/start attempt when it tries" gets old quick
really cold days, 12v, big CCA, big reserve, torpedo heaters,
knowing the tractors starting preferences, and not flubbing it...
As fellow Northerners know, taking off your gloves to 'work' on
something is just not possible some times in hard winter...you'll lose your fingers
(like the day my 07 truck's starter pulled the battery down so far, I lost my radio presets..it started though...did I attempt a tractor start that day?....nope)
to the OP, like said, 'trouble with the points' will be the same at any voltage, got to get that straightened out first