On a 12V system with a ballast resistor,with the ignition on and the points closed, Voltage on the primary coil to distributor lead should read 0 volts as you say. the lead from the output of the resistor to the input of the coil should read near 6V and the ignition switch side of the resistor should read 12V.
As John T says, a resistor only drops voltage when their is a load on it. If the ignition points are open, their is no load and the entire ignition primary system will read 12V, thats why it is important to have the points closed when measuring voltage at various points in the ignition system.
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