What's the best way to find a dead cylinder?

volaredon said

In my case as I remember it was a hot dry day. Don't remember exactly, that was a long time ago. Maybe it was humid out? Definitely remember it didn't feel like a "damp" day, definitely wasn't raining.

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Up here they dump calcium chloride on the roads by the ton. Snow and ice is melted and the spray gets on wood power poles. In the spring it will be OK until we get a foggy day or light drizzle, which gets the built up layer of road salt and dirt damp. The high voltage can them start to track down and catches the poles on fire. A heavier day of rain will wash the salt and dirt off so there will be no problem.
Once it starts to carbon track it does not get better on its own and gets worse even when dry.
Dad bought a 67 Merc in 69 with a 390 2V. Eventually it was not starting well. One evening he had it running on the driveway as it was getting dark out. He noticed the plug wires glowing blue as the spark energy went along the wires. He said it was like they were clear plastic tubes with shots of blue liquid going through. The next day he got a new wire set and installed them. Started on the first couple of revolutions agai .