The wire from the - coil terminal to the points, with the points closed, it should drop to 0 volts, and the wier from the switch to the + terminal of the coil should stay near battery volts, or drop to around 8 volts if there is a resistor.
If the - terminal volts do not drop to 0, the points are not making contact, the wire from the coil to the points is open, or the distributor housing/breaker plate has lost it's ground.
If the volts to the + terminal drop to below 9 volts, (or 5 volts with a resistor) with the points closed, there is a problem with power to the coil. Check the ignition switch, connections to the switch, wiring between the switch and coil.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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