Use the voltage inputs
Insert the black lead into COM and the red lead into V/Ω. Select DC volts. Do not put the red lead in a current input for this test. Select a voltage range suitable for a 12V battery if the meter is manually ranged.
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Measure the terminals
Touch red to the positive terminal and black to the negative terminal. Read and record the voltage with the test conditions. Fluke suggests briefly operating headlights after recent engine running to remove surface charge, then switching them off before measuring.
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Interpret the limited result
Fluke gives approximately 12.6V as a fully charged conventional lead-acid reference. A resting reading is a starting point, not a load-capacity test. Compare it with the battery manufacturer’s information and pursue appropriate testing if starting performance remains poor. Remove probes after recording the result.
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Sources / references 1
- Fluke — Measuring battery voltage ↗Reviewed Oct 8, 2026
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