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MSD 8224 coil resistance


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Hi all, bought 2 of these coils less than 1000 miles ago but more than a year, so no guarantee. I think one of them is not working properly. The coils are off the car.

With a multimeter how do I measure a) the secondary resistance ,should be 7.8 K ohms and b) the primary resistance should be 0.35 of 1 ohms ,is there a meter out there that measures this  low value accurately?

These coils are round ,the latest 8224 coils are square, will one of each fit on the S4 ignition module? I am assuming the specifications are the same.Thanks for any help.

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