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coil

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ranba36

New User
I have a Ford 2N. Its been changed from a 6-volt to a 12 volt. If i replace the coil do i need a 12-volt coil?
 
If its now 12 volt and I was gonna buy a new coil, I would get a full true 12 volt coil (some call them internally ballasted) and no external ballast resistor is needed. The alternative is to use a 6 volt coil PLUS an external series voltage dropping (12 to 6) ballast resistor.

John T
 
True is, John, nobody sells a TRUE 12 Volt coil for the front mounts.

The general consensus is to use the OEM ballast resistor with the "so-called" 12 Volt square-can coils that are being sold these days.

ranba,

If you want a functioning igntion system that will last, TAKE NOTE...

For 12 Volts...

"12 Volt" square-can coil... use WITH OEM ballast.

6 Volt square-can coil... use with OEM ballast PLUS a converting or "dropping" resistor.
 
Generally speaking, most conversions don't add a resistor, but instead use a so-called 12 volt coil. If you're uncertain whether or not a resistor has been added to your tractor, you can check the voltage at the ignition switch side of the coil. First make sure the points are closed by verifying that the distributor side of the coil is at zero volts referenced to ground. Then check the voltage on the other side of the coil to ground. If it's between six and eight volts you have a resistor somewhere. If it's at twelve volts there's no external resistor.

Note that it's common to see conversions where the original coil was used with no external resistor. This will result in very short point life. If you suspect this is the case with your tractor, swap the coil out with one that specifies "no external resistor required".
 
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