What are common symptoms of a failing alternator?

Dimming headlights and dashboard warning lights are indicative of a failing alternator because the alternator is responsible for supplying electrical power to the vehicle's systems after the battery is initially charged. When the alternator begins to fail, it cannot produce enough voltage to support these systems, leading to dimmed or flickering headlights as well as illuminating warning lights on the dashboard, which may signal low voltage or charging system issues.

These symptoms are often subtle at first but can progressively worsen, and they serve as key indicators for technicians when diagnosing alternator-related problems. Understanding these symptoms helps in taking timely action and potentially preventing further electrical system failures or complete battery drain while on the road.