ballist resister on Farmal H

charles marshall · May 4, 2013

I have a low spark to the plugs. Will not start. Turns over then wines like a old chevy that's flooded. ( had carburetor rebuilt )It has a 12 volt coil. Will it do any harm to remove the resister. Hoping to get more voltage.

John T · May 4, 2013

If its a 12 volt system and has a true 12 volt coil YOU DO NOT USE A BALLAST OR THE SPARK WILL BE VERY WEAK.........(Toss the ballast)

A true 12 volt coil may be labeled "12 volt" orrrrrrrrrrrrr "12 volt NOT for use with ballast resistor" or "12 volt no ballast required"

A coil labeled "6 volts" or "12 volts for use with Ballast resistor" is in reality a 6 volt coil AND DOES NEED A BALLAST ON A 12 VOLT SYSTEM or it will overheat plus burn points quickly

Contrary to Billy Bob and Bubbas belief those coils DO NOTTTT I REPEAT NOTTTTTTTT HAVE A STAND ALONE DISCRETE BALLAST RESISTOR TUCKED AWAY SOMEWHERE INSIDE THE CAN.

Many typical old tractor 12 volt coils will have a LV primary resistance (measured between + and - terminals) of around 2.5 to under 4 ohms

If you have a 12 volt tractor and a 12 volt coil DO NOT USE A BALLAST OR THE SPARKS VERY WEAK

If I missed anything please add to this gents

John T

ballist resister on Farmal H

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