mkirsch's method will work. But it has the voltmeter energized continuously. Not a problem if you run the tractor every few days. However depending on the resistance of the voltmeter, it will drain the battery if left unstarted for a couple weeks/months.
Preferred is to wire the voltmeter so it's energized only when the ign switch is "on":
1 - Remove the wires from both ammeter posts and connect all them together. Thoroughly tape/insulate the connection!
2 - Connect the + voltmeter terminal to the switched (coil) side of the ignition switch. Connect the - terminal to a GOOD ground.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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