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Q: How do you test a coil ? on 1990 Jeep Cherokee

Asset 21
I am not getting any spark ! If it is not a coil what can i look at next ?
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Pull the plug off of the coil and check for 12V on the B+ side of the plug. If not 12V, I would suspect the Engine Control Module which can be reflashed if you get the whole car to the dealer ( 1hr bill time roughly $100) or else I have been told that it could be the Ignition Switch.
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