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 Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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