I don't hae a photo that I can scan and send, but if you've got a four-position switch (which would be the case if you've got a field resistor in addition to the dimmer coil on it) look at Bob's diagrams 3 and 4, depending on whether you have a magneto or a battery ignition. It's as clear as any photograph and, in many ways easier to see what's supposed to go where. The body of the switch should be pretty much square as the diagrams show, with the field resistor hanging off into space at the bottom at a bit of an angle. If the body of the switch you have is round, it would be an aftermarket replacement, though I'm not sure how long those have been available.
As far as that center wire in the ammeter, Farmer Bob's idea about it being aftermarket with a backlight is as good an idea as any I could come up with.
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Today's Featured Article - A Tractor's Point of View - by John Manley. I began my life on August 3,1941. I was actually built at different times and days but I was officially an M Farmall on August 3.I was real nice and shiny. That�s me, in the old picture, third from the left. I was loaded on that train and sent to a little town in South Carolina. I didn�t get to see much of that town. I was moved off the train fast and on to the dealer�s
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