Posted by LenNH on December 06, 2007 at 11:18:47 from (75.69.99.42):
In Reply to: F-20 ammeter posted by Bo Bradshaw on December 05, 2007 at 19:52:28:
Wasn't aware that these tractors came with any electrical system, but could be wrong. There are some F-20s occasionally seen with starters, but I do not know if this was available from the factory or was an aftermarket item. As to ammeters, I THINK that any ammeter which can handle the maximum CURRENT would work. I do not think that the voltage matters, but you might want to check to see if I am correct here. I expect most ammeters show more max current on the dial than they would normally carry. The kinds of generators used on tractors in the days of the F-20 were generally regulated very simply by moving a "third brush." In other words, there was no regulator like those used on cars after a certain point. This setup was cheap (no complex regulator with 2 or 3 internal relays), reliable, and adequate for the little bit of current required to recharge the battery after a few starts each day. The third brush was set to deliver a very small amount current over a long time, so as not to overcharge the battery. There is the possibility that tractor manufacturers thought that voltage regulators would not hold up well under the much-harsher conditions of field use, but I can't say if that is true or just an idea of mine. I don't know when the independent voltage/current regulator came into common use on cars, but I would guess about 1940. I am pretty certain that even tractors like the H and M didn't use an independent voltage/current regulator, but I can't say if IH might have gone over to this type of setup before upgrading these tractors to "super" status. This is all "from memory," which is to say from my spending years around these tractors, but really back when they were new or almost-new. I would certainly like anyone who knows more about these things to comment and to correct anything I've said that "ain't right."
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