Quote:
Originally Posted by Flathead Fever
When you check for the "available" voltage at the coil you need to remove the wire you are checking voltage at or make "sure" the points are open, otherwise if they are closed the circuit is complete and you will be doing a "voltage drop test" and get a zero reading or a slight voltage reading instead of the actual available volage to the coil.
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Disagree with that. If you disconnect the wire to the coil, (or engine stopped with points open) you will just read battery voltage. That doesn't tell you anything.
You need current flowing when measuring voltage at the coil, to account for the voltage drop thru the ignition resistor, and any parasite resistance thru the switch or elsewhere.