What is the expected reading for the ammeter/voltmeter gauge?

Answer: C — 12 - 14 volts

The expected reading for the ammeter/voltmeter gauge in a properly functioning vehicle, particularly during a pre-trip inspection, should fall within the range of 12 to 14 volts. This range indicates that the vehicle's battery is adequately charged and that the alternator is functioning correctly, supplying the necessary voltage for the vehicle's electrical systems. A reading below this range could imply a potential issue with the battery or alternator, while a reading above this range may indicate overcharging, which can lead to battery damage or other electrical problems. Ensuring the gauge reflects a reading of 12 to 14 volts is crucial for safe vehicle operation.