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AC B coil voltage.....

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08-17-2005 20:06:32

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I am converting to didtributor (Farmall H) with a solenoid feeding 12v to the starter. I have a ballast resistor to supply 6 volts to the coil. Should I also supply the coil with 12 volts off the solenoid during starting? Seems like most early automobiles did this. Thanx much, Chuck

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John T

08-17-2005 20:40:32

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 Re: AC B coil voltage..... in reply to ACIdaho, 08-17-2005 20:06:32  
AC, sure you could rig it up to do that, but unless the tractors worn out and/or she cranks real slow in extreme cold weather, I agree with Denny, I doubt you really need it.

That being said, if your solenoid is similar to the Ford solenoids that has BOTH the lil S activation terminal PLUS the I terminal, that I terminal is for such a purpose and ITS HOT ONLY WHEN THE STARTERS CRANKING. All you would need to do is run a wire from it to the coils high input (from ballast NOT to distributor) terminal thereby by passing the ballast and feeding unballasted battery voltage to the coil when shes cranking for a hotter starting spark.

They make Ignition switches that could be rigged n used to fulfill the same purpose. They simply feed the ballast and coil in the regular ON position but have a separate isolated contact to feed the coil direct (by pass around ballast) when in the START position.

John T Nordhoff in Indiana, retired electrical engineer who normally lurks on the Mother Deere pages versus over here on the dark side lol

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Texas Denny

08-17-2005 20:23:06

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 Re: AC B coil voltage..... in reply to ACIdaho, 08-17-2005 20:06:32  
You could do this but it will require a double pole starter switch. One pole will kick in the starter. The other pole will provide full battery to the coil. It really, however, is a needless exercise. All of these old tractors start exceedingly well on 12 volt. The coil boost is overkill. That is, unless you live in the cold of Northern Minnesota. Perhaps it has an advantage there.

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