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Why alternators fail

Most common reasons why alternators fail

Alternators fail due to Mechanical Wear and Tear

  1. Bearings: Over time, the bearings inside the alternator can wear out, leading to noises, overheating, and eventually failure.
  2. 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

  1. 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.
  2. Diode Failures: Alternators contain diodes to convert alternating current (AC) to direct current (DC). If one or more diodes fail, the alternator may produce a reduced output, or allow AC voltage to enter the car’s electrical system, leading to various problems.

Environmental Factors

  1. Heat: Excessive heat can damage various parts of the alternator, including windings, diodes, and other internal components.
  2. Moisture: Water and other fluids can cause corrosion or short-circuits within the alternator.

Poor Quality Components

  1. Substandard Materials: Cheaper, non-OEM (Original Equipment Manufacturer) components may not meet the required quality standards, leading to premature failure.
  2. Inferior Brushes: Poor-quality carbon brushes can wear out faster, disrupting the electrical connection between the rotor and stator.

Lack of Maintenance

  1. Insufficient Inspections: Regular maintenance checks can catch problems like loose connections, worn belts, or signs of corrosion that could lead to alternator failure if left unaddressed.
  2. Aging: Just like any other mechanical component, alternators have a lifespan. Even with perfect maintenance, they will eventually wear out and require replacement.

External Factors

  1. Battery Issues: A failing battery can put excessive stress on the alternator, causing it to overwork and fail prematurely.
  2. Electrical Overloads: Adding accessories that draw power heavily from the electrical system without upgrading the alternator can lead to its failure.

Understanding these potential causes of alternator failure can help in early diagnosis and timely repair, preventing inconvenient breakdowns and costly replacements.

©, 2023 Rick Muscoplat

Posted on by Rick Muscoplat

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