Most common reasons why alternators fail Alternators fail due to Mechanical Wear and Tear Bearings: Over time, the bearings inside the alternator can wear out, leading to noises, overheating, and eventually failure. Serpentine Belt: A worn or loose belt can reduce the alternator’s effectiveness in generating electricity. In extreme cases, the belt can snap, rendering the alternator useless. Electrical Issues Voltage Regulator Failure: The voltage regulator controls the electrical output of the alternator. When it fails, it can cause overcharging or undercharging of the battery, ultimately damaging the alternator. Diode … Read More

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