10SI Delco with proper installation and good wiring and connections is very dependable. I, myself prefer the 3 wire setup.
He has a magneto, so his on-off switch is a grounding kill switch so no switched 12 volts to excite the #1 pin on alternator.
Some options to excite the #1 pin would be a momentary push button to apply voltage, but would have to remember to press it each time you start the engine. Could also use an oil pressure activated switch, or a double pole-double throw toggle switch with one side activating the alternator in run position and other side to ground the mag in stop position. Caution on this is that switch could get bumped on with engine not running and damage the alternator.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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