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Yes, ballast resistor is the same as primary circuit resistor. It is in a series circuit with the primary side of the coil. The purpose is to control the amount of current flowing through the coil. The coils were not designed for the full 24 volt supply, so an external part was added...

You can test it with a digital multimeter, measuring across the posts I would expect a value in the neighborhood of 1.5 ohms could be a bit more or less. 0 ohms would be a dead short and getting no reading would indicate that its an open circuit like the one you were having issues with.

If the ballast resistor is open there will be no power to the ignition coil. If someone knows the value (ohms) for the resistor we can likely locate a modern replacement that's more readily available.