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Farmall & IHC Tractors Discussion Forum
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F-20 ammeter

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Bo Bradshaw

12-05-2007 19:52:28




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Does anyone out there know what the proper ammeter would be for my 1939 F-20? Seems like an H one would do but want to make sure and get the correct one if possible. Thanks, Bo




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Dakota Bob

12-06-2007 17:22:45




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 Re: F-20 ammeter in reply to Bo Bradshaw, 12-05-2007 19:52:28  
I've got a '35 F-20 with a starter, lights, and electrical system. It has exactly the same system as the early H's and M's with the oval switch box with the ammeter in it clamped to the steering post. It all works including all of the lights. It was equipped that way many years ago when I found it abandoned with a cornpicker on it. That owner obviously enjoyed using the starter rather than cranking it through the fold-up snoot on the cornpicker.

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LenNH

12-06-2007 11:18:47




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 Re: F-20 ammeter in reply to Bo Bradshaw, 12-05-2007 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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Scott Rukke

12-06-2007 06:58:12




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 Re: F-20 ammeter in reply to Bo Bradshaw, 12-05-2007 19:52:28  
I would like to see a picture of your F-20 with an ammeter if possible. Never seen one mounted on an F-20 before.



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Bo Bradshaw

12-06-2007 14:31:18




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 Re: F-20 ammeter in reply to Scott Rukke, 12-06-2007 06:58:12  
Scott and Lyn, Thank you for your comments. This F-20 W/F has elec. start and two headlights and one tailight. The original generator had the simple setup you referred to Lyn but when I got it rebuilt, the guy put a "modern" regulator on it so I now have the opportunity to put an ammeter on it. Sounds like I'll look for the oldest one I can find-early forties- and go with that cause it may well have not had all of this stuff originally anyway. Bo

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