1) An original 6 Volt battery powered Farmall H coil ignition (NOT talking a magneto ignition) would NOT have had any ballast resistor nor any ballast by pass when starting system.........
2) If its a magneto ignition, it doesn't use battery for ignition, so no ignition change required when switching from 6 to 12 volt
3) If its a battery powered coil distributor ignition you can EITHER add an external series voltage dropping (12 down to 6) ballast resistor before the old 6 volt coil and use it orrrrrrrrrr use a full true 12 volt rated coil NO ballast required.
4) For a battery powered coil distributor ignition if you switch from POS to NEG ground the coil leads would need reversed. IE Match the coil polarity to suit the ground be it original POS or newly converted for Alternator NEG ground.
5) Of course for an Alternator as most all are NEG ground you switch the battery to NEG ground in which case per above the coil leads need reversed PLUS the ammeter leads need reversed.
6) A One Wire alternators output would wire to the ammeters LOAD (NOT battery/starter) side terminal, thats where the BAT terminal on a VR or Cutout Relay would have wired before
7) Change light to 12 volt.
Im sure I missed something so hopefully the other fine gents here can add to this
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