Final answer:
The alternator warning light indicates trouble in the vehicle's electrical system. It is a sign that the alternator or another component might be malfunctioning and requires a professional check.
Step-by-step explanation:
The alternator warning light on a vehicle's dashboard serves as an alert to potential issues within the vehicle's electrical system. Specifically, it indicates trouble in the electrical system, which may include a malfunctioning alternator or other electrical component problems. It does not mean that the alternator is working okay, that the alternator is checking itself out, or that the alternator is too hot. It is crucial to have your vehicle checked by a professional when this warning light illuminates to prevent further damage and ensure your vehicle operates safely and reliably.