Hi Fred If you have an
oil filled coil and it is mounted on it's side instead of straight up the coil windings will get a hot spot after time. It will burn out. Vibration and heat are the other killers of coils. A bad coil wire can also do the same if the tower conection and coil wire donot have a clean and good contact. Put a touch of high temp silicone grease on the inside of the boot to help keep out moisture. Look for burnt marks on the tower and coil wire, if found they are what killed your coil, poor contacts. Rick Lake