You're on the right track. The resistor drops the 12v of the rest of the tractor's system to 6v to make it compatible with a 6v coil (or a 12v coil which requires a ballast resistor, which I think John pointed out is exactly the same thing). That's it's sole purpose on our tractors.
The 12v coil that does not require the resistor, as I described the other night, deals with the extra voltage by being wound differently internally so that its spark output and interaction with the condenser are the same as the 6v coil.
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