This video shows you how to keep your Harley coil wire plug in place on an open coil. Remove and clean the plugs one at a time. Put a small amount of dielectric grease on the end and install the plug. Use a tie wrap to hold the plug to the coil.
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Harley-Davidson Upgrades: Spark Plugs, Coils and Wires
https://www.fixmyhog.com/video/harle...ection-005166/