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I'm not sure I understand your description of the problem but let's see what happens. First, is the coil an OEM-style coil that mounts on top of the distributor? If not, we'll need a more detailed description of where you took the measurements. Is the coil intended for a 12V or 6V system? (It could be either, we just need to know for sure.) The following assumes an OEM-style coil: With the points open, you should measure battery voltage at the input terminal on top of the coil (and at every earlier point). On a 6V coil with the points closed, you should see between 2.5v and 4v when measuring between the input terminal on top of the coil and the engine block. If it's a 12V coil, you should see somewhere around 10V or so. I don't understand what you mean when you say there is 2-3 volts at "the mount where the rotor sits".
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