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>>Another trick is to just use an old cylinder head with the good plugs screwed into it. It can either be bolted to the block or grounded by using a short piece of wire with an alligator clip on the end. This way you can see all two, four, or six ignition systems firing at once.>>
Sheesh Mumbles….why didn’t I think of that! Especially when I’m testing spark on an older motor that has spark plug terminals of the old type that don’t fit onto the tip of a Lisle-type tester…..
As for the Accu-Spark type testers (and other Neon Testers) one thing I have found is that they seem to light up with even the weakest of spark…..so they are OK for showing the existence of spark bu they are not very useful for ascertaining that the spark is strong enough to fire under compression.
