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How many ohms or resistance in a 3-position light/charge control switch ???

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Alberta Mike

01-25-2002 16:11:36




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Maybe someone can tell me how many ohms of resistance the winding has in the old 3-position light/charge control switches. This was the type that most tractors had during the 40's and maybe even the early 50's. A 3rd brush generator was used with the switch, the generator itself was adjustable for charge output, then the 2nd and 3rd positions of the switch allowed full generator output for charging or lights. The first (in) position controlled generator output with the generator field current flowing through that little wound resistor on the side of the switch.

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steve

01-27-2002 19:24:00




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 Re: How many ohms or resistance in a 3-position light/charge control switch ??? in reply to Alberta Mike, 01-25-2002 16:11:36  
Mike, it dont have to be a three brush generator. A two brush was also used. Normally on a 6 volt system the generator only was made to put out 10 or 12 amps max back in them days. The A terminal went to a voltage cutout relay that was then connected to the battery. The F terminal on the generator, when grounded directly would put out 10 amps. If the F terminal went thru a resistor, it was acting as a " current regulator" and the output dropped to 3 amps for day time use. This is what the switch did. When you pull the light swithc out, the lights come on and the F terminal is grounded. The "resistor " only works during the day time.

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Alberta Mike

01-28-2002 07:51:54




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 Re: Re: How many ohms or resistance in a 3-position light/charge control switch ??? in reply to steve, 01-27-2002 19:24:00  
OK Steve, I think that all makes sense to me. Why I was wondering is because so many guys (and myself) seem to end up with tractors without the switch or a switch that is totally fried and unuseable, then it would be a relatively simple matter I think to make up a "variable resistor" switch that the field current would go through on it's way to ground. It would be independant of the switch that would operate your lights which you'd have to wire in elsewhere. So, when operating the tractor during the day or when you don't need a high charge rate, you'd position this homemade switch so that the current was going through the resistor, or at least through most of it. Then, when you needed more charging amps (battery low or lights on), the switch would be positioned so that the current headed directly to ground (bypassing the resistor or only through part of it). I visualize it as being like one of those variable resistor switches on a heater fan motor that some cars have. Does this make any sense to you, and do you think it would work OK? That's why I was wondering about the ohm resistance of the resistance winding in those original light switches.

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steve

01-29-2002 20:00:39




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 Re: Re: Re: How many ohms or resistance in a 3-position light/charge control switch ??? in reply to Alberta Mike, 01-28-2002 07:51:54  
you got the right idea. dont think it need to be variable. you can try anything. some people use a simple toggle switch, dont even charge most of the time. switch it on for 30 minutes each time you run the tractor a few hours and keep battery charged.



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Red Dave

01-26-2002 17:27:10




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 Re: How many ohms or resistance in a 3-position light/charge control switch ??? in reply to Alberta Mike, 01-25-2002 16:11:36  
A.M.,
The field resistor on the 4 position switch used on Farmall A's, B's & BN's is listed as 2.8 ohms.

Hope that helps.



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