When there is a no-start condition and you discover there is no spark, an easy and quick check in some cases is to check for a primary trigger either with a test light or a lab scope to check for a trigger.
Diagram of a Primary Ignition Circuit
Connect a quality test light to the negative side of the coil and the other end of the test light to ground.
While the engine is cranking if there is a trigger to the control circuit the test light should blink.
Also with a lab scope with the positive lead connected to the negative side of the coil, there should be a control circuit signal on the lab scope screen.
If the primary circuit test well and there is no spark from the coil, you have a defective coil wire or a defective coil.
If you are in the Update Training Class "UT050" for our asynchronous assignment is for you to read this page and explain your understanding
PRIMARY IGNITION Testing: Choose one of the subjects below (1-2) in two or three sentences in your own words explain what you have learned from this page
1.) There is no spark from the coil wire how can you confirm it’s a defective coil
2.) Explain how you would check for a no-start condition from the ignition system
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