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4dFord/SC · 04-13-2019, 04:06 PM

To test the power supply to the coil, disconnect the ignition wire at the coil and turn on the ignition switch. Touch the ignition wire to the negative jumper on your multi-meter and touch the positive jumper to the positive post of the battery (or any good ground, for that matter). The voltage should be equal or close to the battery voltage when the engine is cold. If the car's been run and the ballast resistor has heated up, the voltage should be in the 3-4 volt range.

04-13-2019, 04:06 PM	#3
4dFord/SC Senior Member Join Date: May 2010 Location: Columbia, SC Posts: 1,579	Re: Load Testing '46 Ignition Circuit To test the power supply to the coil, disconnect the ignition wire at the coil and turn on the ignition switch. Touch the ignition wire to the negative jumper on your multi-meter and touch the positive jumper to the positive post of the battery (or any good ground, for that matter). The voltage should be equal or close to the battery voltage when the engine is cold. If the car's been run and the ballast resistor has heated up, the voltage should be in the 3-4 volt range.