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It sounds like a faulty connection to me. The best way to test is not using the ohm meter function of the DVOM. Using the ohm meter will not tell you if the circuit fails under higher amperage load. Use the voltmeter. Start with one lead attached to the positive battery post. Use the other lead to probe the positive circuit from the battery through the fire wall bulkhead,then the ignition switch,though the bulkhead again to the ballast resistor then the coil. Since you are probing positive to positive you should get a zero volt reading. Any reading on the meter shows how much was lost at that individual connection. Test the entire ignition feed circuit and I bet you find a individual or multiple connections with high voltage drop. Repair them as needed. Good luck.
Doug



I was suggesting to check the ballast resistor with the Ohm aspect of the meter.