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Old 11-09-2012, 12:49 PM
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Mallory Promaster Coil Test

Are the following resistance readings within the acceptable levels for a Mallory Promaster Coil Part # 29440:

Product Suggested Resistance:

Primary: 0.6 ohms
Secondary: 12.3K ohms

My Test Results using a voltage meter:

Primary: 0.4 ohms
Secondary: 11.95K ohms

Additional Notes: The coil and resistor/ballast are about 10 yrs. old.
Ignition: Mallory HEI

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Old 11-10-2012, 07:19 AM
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The only real way to test a coil is with an output test on an ignition analyzer. If 10% of the windings are shorted, the resistance change will be very small and difficult to read with an ohmeter, but the output can be down a lot.
Unless it's an open circuit or dead short, resistance readings don't tell you a whole lot.
Your readings are very close to what is specified, if your car is running okay then it's probably good.
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