By December 19, 2012 0 Comments Read More →

How To Test Ignition Coils

Reader Question

I need a little help if you don’t mind.  I’m attempting to test my coil packs.  I found a site that told me what ohms they should read on the primary and secondary sides.  But, I’m not very smart with a voltage meter.  When I’m testing them… where do I touch the red and black wires of the tester… and what ohm setting do I put it on for each side?

Thanks for your help!


Hi there


It’s really not a good way to test a coil even the best mechanics can get false positives that way. We usually just install a known good coil to prove it or you can use a spark tester plugged into the end of the spark plug boot and watch the spark with the engine running.

But even that can be difficult. It’s the strength and timing of the spark that is important. New coils are cheap so I would just buy one and try it out.


Austin Davis
Posted in: Spark Plugs

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Austin Davis, consumer car repair advocate. "Hi there! I love to help people solve their car repair problems and I hope my site was helpful to you today. Thank you for stopping by."