The starter is an electromagnetic field type NOT a Permanent Magnet so it will still turn the same direction regardless if Polarity is reversed. I've used plenty of 6 volt starters at 12 volts with no problems HOWEVER it can be a bit tougher on starter drive mechanisms. I've also successfully used 6 volt gennys to charge 12 volts simply by changing to a 12 volt Voltage Regulator BUT BEFORE ANYONE HAS A CALF it didn't set the world on fire as far as charge rate and its possible the fields might overheat and its NOT engineering correct Im ONLY saying it worked so Billy Bob can calm down now lol. A genny shop can change fields and convert it to 12 volts or else just get a 12 volt genny and VR.
You can keep the 6 volt coil and just add an external series voltage dropping (12 to 6) Ballast resistor or else get a full true 12 volt coil no ballast required.
Coil polarity would be switched if you change polarity.
If it has an ammeter and you change polarity its leads need reversed.
12 volt lights.
Be sure to Polarize the genny BEFORE start up.
If I missed anything hopefully other gents can add more to this
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