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Restoration & Repair Tips Board

Re: 1950 H Charging system

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Bob M

11-26-2012 12:04:12
69.207.86.27



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That resistor and the associated F terminal are used only if the tractor has no lights. (With no lights the generator FLD terminal gets connected here instead of to the light switch field terminal.)

Do not connect the light switch field control this terminal! Doing so reduces maximum generator output to about 3 - 4 amps in the H, D and B positions, and to almost 0 amps in L.




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Crazy Horse

11-28-2012 07:19:24
108.173.38.154



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 Re: 1950 H Charging system in reply to Bob M, 11-26-2012 12:04:12  
OK, so I have a Farmall A where the tractor has no lights but still has the 4-position charge control/light switch on the dash. I also have a 3-terminal box on top of the generator with one tower inside with the GEN and BAT terminals at opposite ends. The F terminal on this box seems to go nowhere unless hooked to ground through that resistor shown on the photo in which case it would go to ground if hooked up. What harm is done if the field circuit is wired from the generator case field post to the light switch? Even with no lights, then I would at least have the first two positions of the switch to control battery charge rate (which I wouldn't have if I went through the F terminal on the relay box) .... is that right?

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Bob M

11-28-2012 14:05:06
69.207.86.27



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 Re: 1950 H Charging system in reply to Crazy Horse, 11-28-2012 07:19:24  
Must be your A came from the factory equipped with lights - otherwise it would not have the LHDB switch.

That said, what you are proposing (wiring the gen F post to the field resistor on the light switch) will work fine. In fact it's what I'd recommend as it will give you a means to control the battery charge rate.

Go for it!



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John T

11-26-2012 16:38:22
216.249.82.117



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 Re: 1950 H Charging system in reply to Bob M, 11-26-2012 12:04:12  
Cool, I just learned something, thanks Robert. I knew some of the IHC's used that setup but not sure which ones

John T



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