Just to set the record straight, its CURRENT "THROUGH" the ballast resistor (from ign switch, to and through resistor, to and through coil, to and through closed distributor points to ground) that causes VOLTAGE DROP "ACROSS" IT....
Sooooooo, if theres 12 volts at a typical ballast resistors input and the points are good and closed, the current through it will cause a 6 volt drop "across" it leaving 6 volts at the input of a 6 volt coil (as it was designed for).
If you place a voltmeter with one lead to frame ground and with the ignition on and if points are closed, there should be near 12 volts on the input of the ballast,,,,,,,6 volts on the output (to coil),,,,,and near zero volts on the coils output since points are closed.......
Thet are pure passive resistive devices NOT POLARITY SENSITIVE
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