We’ll guide you through how to test a spark plug coil to determine if it’s functioning properly, including the tools you need, common signs of failure, and step-by-step instructions for testing.
You can test a 12-volt ignition coil for effectiveness by checking the resistance of its wire windings with a multimeter. Disconnect your engine's main negative battery cable with a wrench. Pull the main ignition coil wire, the one that leads to the distributor, off the coil.
This article walked me through how to systematically test the ignition coil and other components. Now, I know the proper bench testing procedures, which will really come in handy for diagnosing issues down the road."