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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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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