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 - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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