Just trying to wrap my head around something that may be basic but looking for input anyway. On a conventional wound ignition coil the secondary and primary windings have a common connection. In my mind this is to make a complete circuit for the current that flows from the secondary winding through the spark plug to get back to the source or ground depending on how it is wired. On a waste spark system it is wired like a transformer as there is no connection between the primary and secondary but the current flow makes a complete path from coil tower to tower to complete the circuit. How does a coil on plug with infinite resistance between the primary and secondary work? There is no connection to complete the circuit back to the source which I would view as being the secondary winding. The electrons in the valance ring are getting pushed along by the voltage produce by the collapsing magnetic field from windings of the primary circuit inducing the voltage into the secondary. Don't the electrons need to get back to the secondary circuit where they are generated from? Thanks for any input that can be provided!

DeLyle Kruger
Educator/Instructor
Lake Area Technical College
Watertown, South Dakota, USA