References Grainger: Related Articles. Do not connect the ammeter or voltmeter across the battery. For a 6-volt battery and a small lamp, the circuit current will be in the range of thousandths of an amp, or milliamps. Consult your owner's manual and specific gauge instructions for further wiring details. When current flows through an ammeter, the needle on the meter will move across the calibrated scale.
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How to Use an Ammeter to Measure Current
Help answer questions Learn more. Related Content. They should be 10 gauge or better. Learn more Stansberry, Mark.