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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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