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Compression test followed by an open gap spark test. It’s just good to know it will pass those two tests, even if it is just a bad plug. I know some of you guys like those modules but the old points and condensers are just so simple and bullet proof……To me, the modules just add some uncertainty where there really is no need to add it. Just my own opinion. The other thing, after those two main tests, for me, would be to bring out the cheapo KV meter and/or inline neon spark checkers. My under-$100 KV meter has solved more mysteries quicker than almost any other method I can think of.
https://www.ebay.com/itm/114895532985?hash=item1ac04eb3b9:g:M-gAAOSwVJ9g8yAa
Long live American manufacturing!