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Farmall & IHC Tractors Discussion Forum
Show Parts for Model:

The coyse of the curl

Author  [Modern View]
Dave H (MI)

11-27-2012 10:20:46

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Well, not really a curse but I do need to replace the coil on my 1947 Farmall B. This was the first tractor I took from lawn art to running tractor back in 1997, with much help from the sage masters past and present on this forum I might add. I have checked my archives from back in the day and tested the coil as recommended then and I am pretty sure the coil has gone south on me. This tractor is a 12v conversion and I want to make sure I get the right coil. I crossed off 6v but I am seeing 12v with internal resistors (thinking this is wrong) and 12v with external resistor (which I am thinking is right just without the resistor). I have no resistor anywhere in the ignition circuit that I am aware of. The child behind the parts counter just gives me a blank stare when I ask questions so I am putting the question here. Just a straight 12v coil without any resistors?

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mike Fitz

11-27-2012 14:54:53

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 Re: The coyse of the curl in reply to Dave H (MI), 11-27-2012 10:20:46  
Would you need a resistor between the coil and points?

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11-27-2012 19:32:22

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 Re: The coyse of the curl in reply to mike Fitz, 11-27-2012 14:54:53  
Might work OK there but is usually placed n before the coil. None needed if a 12v no external resistor coil is purchased. Jim

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11-27-2012 14:14:11

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 Re: The coyse of the curl in reply to Dave H (MI), 11-27-2012 10:20:46  
Go to NAPA and get you the IC14SB coil this will solve your problem should cost in the high teens. sold these for years for 12 volt conversions before I retired.

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Dave H (MI)

11-28-2012 07:23:37

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 Re: The coyse of the curl in reply to, 11-27-2012 14:14:11  
Sounds like a plan! Gonna run over there this morning. Thanks!

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11-28-2012 12:59:33

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 Re: The coyse of the curl in reply to Dave H (MI), 11-28-2012 07:23:37  
Quoting Removed, click Modern View to see

Maybe I shouldn't respond, because I don't really know what I'm talking about... but I remember a thread either on here, or one of those "other" tractor forums that talked about the coil being different on these old tractors because of the low rpms and the amount of time the coil was energized (had current flowing through it).
It sounded sensible to me; like the guy knew what he was talking about... I think the point being that you don't want a coil that is made for a high rpm automobile, and if you get the right one you shouldn't need the resistor.

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Dave H (MI)

11-27-2012 12:21:03

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 Re: The coyse of the curl in reply to Dave H (MI), 11-27-2012 10:20:46  
I thank you guys! That is what I thought. By the by, both of you have posts in my archives on this tractor from back in 1997.

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11-27-2012 10:54:47

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 Re: The coyse of the curl in reply to Dave H (MI), 11-27-2012 10:20:46  
There are no "internal" resistors in coils. The primary is just wound with appropriate turns of wire to run on 12v. Rusty is correct

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11-27-2012 10:43:02

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 Re: The coyse of the curl in reply to Dave H (MI), 11-27-2012 10:20:46  
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You need a 12 volt, no external resistor required, ignition coil.

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