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Replace a Spare part Alternator – a defective one or if the limit of use has been already reached. Find out useful information about Alternator

Malfunctions of the alternator

  • pollution, burning or oiling of slip rings;
  • slipping of the drive belt;
  • field break;
  • wear or destruction of the bearings;
  • loose nut of a pulley;
  • contact of rotor and stator poles;
  • wear of the bearing seat;
  • oxidation of brushes.

Symptoms of alternator faults

  • discharging or overcharging (gassing) of the battery;
  • strange sounds in the alternator;
  • battery charge warning light continuously blinks or is on when the engine is running;
  • dim light of car headlights;
  • rattling or quiet sound when the engine is running;
  • extremely high rate of on-board network voltage level;
  • a significant change in the light brightness with increasing number of turns.

Causes of faulty alternator

  • using components of low quality;
  • substantial wear or corrosion of the alternator;
  • breaking of voltage regulator;
  • breakage or deformation of contact springs;
  • violation of operation rules when working outside normal mode;
  • external factors:
    • dirt;
    • high temperature;
    • salt;
    • water;
    • road chemicals.


It is recommended to diagnose the alternator state by means of special measuring instruments: voltmeter or ammeter. You can diagnose the alternator both independently or turn to professionals who will make the necessary measurements on a special stand. If you want to diagnose the part by yourself, then measure the voltage at the battery terminals. Then start the engine and make the same measurements. The norm is: 12 before the engine start, from 13.8 to 14.4 after the start. If you have recorded a higher voltage, then there is "overcharging" (faulty voltage regulator), if low voltage then the current does not flow.

Repair and replacement of alternator

The service life of the alternator does not exceed 160 thousand kilometers. Any mechanical problem can be resolved by replacing the faulty units and components. If you have an older model car alternator you may need to bore slip rings. Drive belts are changed due to wear, the maximum extension or expiration of service life. Alternator rewinding is sometimes found among the services of mechanics, but more and more seldom due to a high cost and inexpediency.

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FAQ: Frequently asked questions
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