Typically, you will test the primary and secondary windings. Ground the spark plug by holding the metal threads against the engine block or a piece of bare metal.
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Testing for Spark Resistance tests are highly accurate, but confirming that the coil can actually produce a spark is the ultimate verification. 5 ohms, while the secondary winding shows a much higher resistance, generally between 6,000 and 18,000 ohms.
This surge is directed to the correct spark plug at the exact moment dictated by the engine's timing. A reading of infinity (OL) indicates a broken wire, while a reading of zero suggests a short circuit.
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Check the wiring harness connected to the coil for signs of chafing, fraying, or loose connections. Refer to your specific Harley model's service manual for the exact resistance specifications, as these vary significantly between years and engine types.
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