Cen, when changing from 6 to 12 volts the starter can remain unchanged and work okay, they can be a bit tough on starter drivers due to that higher kick in torque, but Ive never had any trouble leaving them as is when I converted from 6 to 12 volts, I try to avoid real long cranking times which could get them hot.
It will still turn the same direction REGARDLESS if at Pos or Neg ground.
Most except for custom made alternators are for NEGATIVE ground.
If you have a 6 volt coil and coil/distributor ignition and you go to 12 volts, you must EITHER (if old 6 volt coil is kept) add an external series voltage dropping (12 to 6) Ballast Resistor after the ignition switch before/ahead of the coil OR ELSE use a new full true 12 volt coil NO BALLAST REQUIRED
ALSO if you change polarity the coil leads need swapped, for neg ground the lil + gets switched ignition input voltage with the lil - going to distributor but for Pos ground the - gets ignition switched input voltage while the + wires to the distributor.
The same points can be used regardless for 6 or 12 volts..
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