Ignition Coil Troubleshooting


The discrete ignition coil in older 12V vehicles is an amazing little pulse transformer that multiplies low voltage received from the battery or alternator to many thousands of volts when the breaker points open and close.

This is a companion discussion topic for the original entry at https://www.hagerty.com/articles-videos/articles/2008/07/17/ignition-coil-troubleshooting