Coil on Plug Ignition Systems

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A brief summary on COP systems wiring:

Coil On Plug Ignition: The Wired Differences

Another version, from Underhood Service

 

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What is primary resistance?  How does it differ from secondary resistance?

Ignition System Basic Operation

 

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How to quickly check if a COP is good, and why the boot should be checked/changed every time with plugs:
! No longer available

How to check your ford modular coil on a 4.6- 5.4- 6.8​