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 - Adding an Hour Meter - by Steven Gussey. This article tells how I added an electric hour meter to my 1942 Farmall H after rebuilding it. I wanted to keep an accurate maintenance schedule for my rebuilt engine and the implements I use with my tractor, but the H was never available with a tach
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