How does the design of ignition coils differ?
The design of an ignition coil can range from 2 to 7 pins and everything in between. Also, they could be single coils or multiple, molded into a single housing.
Does the design of an ignition coil affect how you test it?
For multiple coils molded into a single housing, you need to use a testing wand. This will pick up the back EMF during operation and send to the oscilloscope for you to review. This will help you identify which coil is causing the problem.
Do I need to test the primary side as well as the secondary?
Before you test the ignition coils, it’s a good idea to check that the primary 12 volt circuit is functioning properly. This is to confirm that the ignition coil has supply voltage and is working correctly.