That 12v conversion willl have meant some cobblin' on the wires, but nothing major. From stock magneto wiring, it would require only a two-pole switch on the hot to the coil to replace the single-pole grounding switch used to kill the mag. That and a bulb or diode inline between the switch and the alternator to keep the alternator from draining the battery. BobM has had a very helpful set of wiring diagrams posted for some time, showing each layout -- link is below. Follow the link, and compare diagrams 4 and 5. (5 is for an H/M, but the concept is the same - bulb or diode inline in the #1 wire from the alternator.)
I restored the '47 BN my grandfather and his dad bought together when new. Along time int he works, and a lbor of love, but the old girl started up on the third pull of the crank.
Nothin' quite like gettin' an old family tractor runnin' again. Have fun with it!
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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