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If you have access to a coil tester, spark plug should fire steadily at the 1.5 setting on the current knob. To test continuity of the coil: Primary test; connect a test lead to one side of the coil and the other lead to the other side of the coil. Readings shold be between 3.5 to 5.5 ohms. If readings are high or low, replace the coil. Secondary test; remove plug wires from plug and place test leads on plug wires. Readings should be between 68 minimum and 78 ohms maximum. If readings are high or low replace coil. There should never be continuity between the primary and secondary windings. This information is taken from the JD 400 service manual. On a side note, my secondary reading from my tractor is only 40 ohms. Primary was 4.1. The tractor runs great.
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∙ 16y ago
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