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Michael,
The Ampmeter is "inline" with the alternator to tell you when the battery is changeing and dischangeing. The use of #4 wire is to prevent it from getting hot and melting under extreme conditions.
You can use the Voltmeter and get an idea of the state of the battery, but it is not the same thing as the Ampmeter.
The Shunt is a device/metal plate/resistor that has a specific Ohmic reading. When placed across the leads of the meter ( or it may be built in ), the meter will be able to read an accurate current and polarity.
Just more info.
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