With the key on and the points open, you should get battery voltage (12 volts). If the points are closed, you will get a lower voltage - around nine volts. Running, it should average around ten volts. I use the word “around” because the exact numbers are dependent on the specific electrical resistance of your particular coil.
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70 Goat
74 Ventura
63 Cat
56 GMC
et al.
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