Fairbanks-Morse Magneto help

67Dart273 said
On that note, ohm readings are not very dependable for coil ttroubleshooting. A few partially shorted turns in either primary or secondary will never be detected, and moisture ingress causing a high voltage leak won't show up many times on a meter, either Even a "Megger" I have one 500V and 1000V and it is not enough to test coil insulation--as they generate much more in operation

If you don't have some form on specialized coil tester, you have to just "guess."

I suspected the coil and I took readings on the old one compared to the new one and there was a big difference, plus as said according to what I read on line something appeared wrong
Decades ago the mag went bad on my SA200 Lincoln welder, there was no internet and so I thought the thing was complicated and I needed the machine running asap
I found a Mag shop and bought a rebuilt. All I recall, it wasn't cheap. Fast forward to a couple of months ago and thanks to the internet I found two excellent video's on rebuilding it, plus many parts vendors.