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Farmall & IHC Tractors Discussion Forum
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Farmall M 12 Volt Ignition

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Richard Fazio

03-15-2006 12:07:59




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The coil on my M burnt out this weekend. I figured it out pretty quickly and ordered a new one already. My question though is this. I have a 12 volt system on this tractor. The coil I bought says it's a 12 volt coil for use without a resistor? I'm guessing they mean you don't have to use a resistor to step the volts down to 6 volts for this coil since it's 12 volt. But do you need a ballast resistor? In the car world, when you had a 12 volt coil you wired it so you got a full 12 volts while cranking and then once started you went through the ballast resistor for some lower voltage to run on. If you ran constantly on 12 volts the coil would burn out? I think that's what happened. Or are these tractor coils meant to have constant 12 volts?

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Richard Fazio

03-15-2006 16:25:21




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 Re: Farmall M 12 Volt Ignition in reply to Richard Fazio, 03-15-2006 12:07:59  
Thanks for the info Gentlemen.



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John T

03-15-2006 14:20:57




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 Re: Farmall M 12 Volt Ignition in reply to Richard Fazio, 03-15-2006 12:07:59  
Richard, the only way to tell for sure is to measure the coils primary resistance between its lil + and - terminals, and if its in the at least 2.5 to around 3.5 ohms range, its fine for the straight full 12 volts use NO BALLAST REQUIRED. If a coil and points ignition system is ran at more then the designed for current (around 4 amps max) the coil runs hot and degrades and the points burn up prematurely.

Many off the shelf 12 volt automotive coils will work fine UNLESS they were for autos that used various sizes of Ballast Resistors.

The start on 12 and run on 6 volt thing you mentioned was used on some tractors and autos, but it required some sort of Ballast By Pass circuitry to work.

John T

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Bob

03-15-2006 13:58:06




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 Re: Farmall M 12 Volt Ignition in reply to Richard Fazio, 03-15-2006 12:07:59  
AFAIK, no resistor means NO RESISTOR, ballast "dropping", converting, or otherwise.

The coil SHOULD have enough prinary windings to handle the full system voltage WITHOUT any resistor.

It's not just a "tractor thing". Some vehicles were also set up without resistors.



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