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Farmall & IHC Tractors Discussion Forum
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Field resistor for generator???

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DieselDog1

01-26-2006 10:10:15




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I'm completely new to Farmall Cubs. This site has provided more information than I could have ever imagined. I have a 1949-50 Cub. The generator wasn't working so I cleaned it up and now it's mint. The only other thing not working is the LOW charge option. The field resistor was shot, and all attempt to read the resistance on the original have failed. Can someone tell me what the field resistor resistance should be to cut the generator from high to low charge??

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BillyinStoughton

01-26-2006 14:43:41




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 Re: Field resistor for generator??? in reply to DieselDog1, 01-26-2006 10:10:15  
Janicholson is on the right track. I used a 3 ohm resistor with a dissipation of 60 watts on my 52' H generator (w/ regulator). Works like a champ!



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DieselDog1

01-26-2006 13:55:04




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 Re: Field resistor for generator??? in reply to DieselDog1, 01-26-2006 10:10:15  
Thanks guys! It"s that kind of info that makes websites like this great. I really appriciate the help.



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Janicholson

01-26-2006 12:23:23




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 Re: Field resistor for generator??? in reply to DieselDog1, 01-26-2006 10:10:15  
John T has it correct.
Three Ohms would be reasonable. There is going to be wattage that needs to be dumped (less than 20) however if being conservative is good, I would use a resistor that could dissipate 30 watts. Resistors heat up, that is where the power goes. A ready source might include a heater blower resistor from automotive heaters. They come in a package with 2, or three resistors mounted on a small plate. One of these will probably check in close to 3 ohms. (or use a combination of them to achieve about three ohms) Only use mechanical connections, not solder to fasten the resistor wires if you remove them from their assembly.
Good luck,
JimN

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John T

01-26-2006 10:57:39




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 Re: Field resistor for generator??? in reply to DieselDog1, 01-26-2006 10:10:15  
Dog, I have absolutely no specs or data whatsoever, but can offer an engineering educated guess. HOWEVER if Bob M or ElToro or Janic have data to the contrary, you better believe them over me. I'm knee deep in theory and give Seminars at the national John Deere Shows and used to write technical articles for The Green Magazine but havent owned Farmalls in yearsssss sss.

My best guess is that resistor would be in the range of 2.5 to 3.2 ohms, probably wirewound, and of course, must be a power rated unit. My assumptions are for a field to draw 2 amps at 6 volts, it would be around 3 ohms resistance Sooooo oo an aditional 3 ohms in series would cut the field current in half. Another thing is those off the shelf generic power resisitors dont come in every ohms, so try whats available n see the resultant charge rate, so go from there, maybe start around 2.5 ohms n see what happens.

Thats the best I have for ya

best wishes n God Bless

John T

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