How often should an alternator be replaced?

An alternator usually lasts between 80,000 to 150,000 miles or 7 to 10 years, depending on the vehicle and driving style. However, there's no fixed replacement schedule like with oil changes or filters. Instead, alternators should be replaced based on their condition and performance.

Signs your alternator might need replacement include:

• Dim or flickering lights: Your headlights or dashboard lights may flicker or dim.
• Battery warning light: The battery light on your dashboard illuminates, signaling charging problems.
• Electrical failures: Malfunctions in power windows, radio, or other electronic parts.
• Weak or dead battery: A failing alternator might not correctly charge the battery, causing it to weaken or die.
• Strange noises: Grinding sounds may indicate alternator-bearing problems.

To avoid unexpected alternator failure, regular checkups during routine maintenance are key.

Wondering how often should an alternator be replaced? Call our ASE Certified Mechanics at Clausen Automotive, The Hybrid Shop, for more information about starters, alternators, and car batteries and to request an appointment. Since 1975, our family-owned auto repair shop has proudly served vehicle owners in Madison, WI, and the surrounding communities.