Been a while but info I can provide should be correct; trying to recall the exact process I used to follow that was successful...lol(usually)
1)Battery should be removed and completely (fully discharged), then and only then charge battery insuring correct polarity. Do not reconnect battery yet!
2)Disconnect generator, voltage regulator, and ignition (discharge any residual charge), then check and connect circuits insuring correct polarity.
3) Connect battery insuring correct polarity and polarize generator and regulator!
If I remember the polarity test correct you could test polarity monitoring direction of igniton arc using a pencil attached to a spark plug lead! If the igniton arced from the block side to the pencil it was reverse polarity. More I think about it I would hand crank the engine no battery monitoring ignition arc to check polarity before making connections!
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