Like the others say, check voltage at the battery with an analog meter.
A point type ignition system operating perfectly normal, will put voltage spikes in the system that will sometimes drive a digital meter nuts.
A few months ago I was working on my Big Mo 400 Moline, a system voltage check with a digital meter showed totally bonkers system voltage readings. I laid the digital meter away and grabbed my cheap battery load tester with an analog meter. system voltage now read a rock steady 14.4 volts from the Delco 10SI alternator. Nothing was wrong with the tractor, just Voltage spikes from the ignition system confusing the Digital meter.
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Today's Featured Article - On the Road with Dave Gohl: Deere Departed Friend - by Dave Gohl. Have you ever had to part with a dear friend? It's not easy. If it's due to death, your feelings could be in disarray for days, months or even years. Even now after almost 4 years, I still miss my dad. I remember when I was a kid my dad sometimes would tuck my brother and I in at night and we would ask him questions about his childhood on the farm. To this day, it's some of the best stories I've ever heard. And now, I'm so glad that I asked those questions, and if I were a little smarter i
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