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 - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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