Carbon powder can get out of the ends of the fiberglass threads.After enough is gone an arc will start opening a gap in the wire.I have found many wires that read open.Test sets have a wire test function.The reading can predict that a wire is failing It has been considered bad practice to let a magneto fire into an open circuit because the secondary winding can arc to it self.You can hear a fence charger secondary arc to it self.A normal fence line loads the charger enough to keep the voltage peaks down.Fence chargers are run after repair with a 500 ohm load for testing.The Model T coil I use for testing has its own spark gap.No engineering but I have three 5 gallon pails of bad fence charger transformers in the shop now.All have been damaged by lightning or running on open circuits.New chargers are starting to have spark gaps in the case.No reason to have fake wire on tractor ignitions.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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