During a preflight check of the electrical system, which step directly confirms the battery's health by measuring voltage?

• A. Check alternator/generator operation
• B. Verify battery voltage
• C. Inspect fuses/circuit breakers
• D. Ensure essential systems have power

Answer: (B)

Measuring the battery’s voltage directly shows its actual electrical potential and indicates the state of charge, which is a direct read on the battery’s health. When you read the terminal voltage with a voltmeter, you get a quantitative check: a healthy, fully charged 12-volt battery typically reads around 12.6 to 12.8 volts with no load; a noticeably lower reading suggests discharge or possible failure and signals you may not have reliable cranking power. Other steps assess related aspects but don’t quantify the battery itself: verifying the alternator/generator operation tests whether the charging system can replenish the battery, inspecting fuses and circuit breakers checks protection and continuity, and ensuring essential systems have power confirms power delivery to systems but doesn’t tell you the battery’s actual health.