Amazon Video

No Spark Troubleshooting [Mopar Electronic Ignition with Ballast Resistor]

This is a vintage ignition system but we are going to apply the same processes we use today to troubleshoot a no spark conditions on this system. All you need is a simple test light to follow along!
The truck being used is a 1978 Dodge Power Wagon W150

Control Testing Ignition Coils:
No Spark Diagnostics “Control Testing” Part 1 [an ScannerDanner Premium video]
No Spark Diagnostics “Control Testing” Part 2 [an ScannerDanner Premium video]

00:00 intro
00:47 what system we are working on
01:25 ignition coil voltage readings
02:20 thermal camera view
02:40 primary current flow
05:00 don’t leave your key on!
06:40 what no ground on the ICM looks like
08:40 control testing with a test light
12:00 importance of the cranking bypass circuit
17:45 bypass circuit enabled vs disabled during cranking
19:05 what a faulty pickup coil looks like
20:38 pick-up coil bypass test
22:40 resistance test of the pick-up
24:40 me stabbing myself with a pin
25:00 pick-up coil output voltage test
27:35 why I don’t like the voltmeter for coil negative control testing
31:20 flow chart for no spark diagnostics on this system
31:45 forum post for access to my flow chart

ScannerDanner Tools:

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 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!

Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

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