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What Causes High Voltage in a Car Alternator?

1 Answers

McDominic

07/29/25 1:31pm

Car alternator voltage is too high due to abnormal voltage regulator. It is necessary to check the alternator's regulator and replace it according to the alternator model. When the alternator voltage regulator malfunctions, loses control, or has abnormal voltage detection circuitry, it causes excessive alternator output voltage. Additional information: 1. Alternator working principle: The alternator operates using electromagnetic induction, with output voltage varying according to the rate of change in coil magnetic field strength. In an alternator, the rate of magnetic field change is regulated by the alternator's rotation speed and excitation current, meaning the output voltage is determined by the alternator's excitation current. 2. Alternator voltage: The alternator voltage changes with vehicle speed. When the speed is higher than the battery voltage, the maximum voltage exceeds 30% of the battery voltage. When the speed is lower than the battery voltage, there is no voltage at minimum. 3. Voltage regulator: Every car has a voltage regulator whose function is to reduce the alternator's high voltage to a certain range for vehicle use. When charging the battery at low alternator voltage, the regulator automatically draws current from the battery to ensure the vehicle always has stable voltage supply.

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