Posted on 2/26/2026
Your vehicle relies on a complex electrical system to operate everything from the headlights to the engine management system. At the heart of that system is the alternator. When the alternator begins to fail, it can cause a range of issues that affect performance, reliability, and safety. Because alternator issues often mimic battery or electrical problems, they can be confusing for drivers. Recognizing the warning signs early can help you avoid breakdowns and costly repairs. What Does the Alternator Do? The alternator generates electrical power while your engine is running. It keeps the battery charged and supplies electricity to all of your vehicle’s electrical components. Once the engine starts, the alternator takes over, enabling systems such as headlights, climate control, fuel injection, and onboard computers to function properly. When the alternator fails, the battery must supply all electrical power. This quickly ... read more