If youre converting to 12 volts Id use Negative Ground sam as Bob M,,,,,, I would use a 3 wire (BAT ARM FLD) full fledged 12 volt Voltage Regulator versus messing with a Cutout Relay and any LHBD ligth switch charge regulation. Make sure the VR is suitable for NEG ground,,,,,,
BAT on VR to load (NOT battery/starter) side of ammeter......ARM/GEN on VR to ARM post on Genny,,,,,FLD on VR to gennys FLD post,,,,,loads like lights/ignition switch get hot battery voltage supply from LOAD side of ammeter, same terminal that wires to BAT on VR. Other Supply side of ammeter gets hot battery voltage often where big battery cable wirres to starter switch.
If it was Pos ground before, ammeter leads need reversed or it will read bass ackwards.
Polarize the genny BEFORE start up
LOOK AT BOB M'S WIRING DIAGRAMS
If this isnt the answer youre looking for I dont know what to tell you
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