What does a properly functioning ammeter indicate?

A properly functioning ammeter provides critical information about the vehicle’s electrical system, specifically indicating that the alternator or generator is charging the battery. When the ammeter shows a positive charge, it demonstrates that the alternator is successfully providing electrical current to the battery, replenishing its energy and powering the vehicle's electrical components.

Understanding the function of the ammeter is essential for ensuring that the vehicle’s electrical system is operating effectively. If the ammeter shows a negative reading, it may indicate that the battery is discharging rather than charging, which could lead to electrical failures or a dead battery.

In contrast, the other options describe issues unrelated to the primary role of the ammeter. Overloading the vehicle, fuel system problems, or steering system malfunctions are indicated through different gauges or symptoms, and do not reflect the ammeter's function in monitoring electrical charge levels.