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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Today's Featured Article - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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