How to test an ignition coil/module with a test light (distributor ignition) – GM

The tests shown in this video can be used on most ignition coils with the exception of the 3 and 4 wire coil over plug systems.
When you have no spark from an ignition coil, you must first test for “control” (the switching on and off of the coil). There are multiple ways to do this. I show two methods in this video. One is using a basic test light and two is using a scope and low amp probe. Finally, I show how to perform a resistance test on the coil itself, using an ohmmeter.
Visit my website, for more about my eBook and lectures.
Visit our school, to be part of my class in person.
Visit if you would like to be part of my on-line class. For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium right here on YouTube. There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

Post time: 07-17-2017