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What is the voltage of a car alternator?

1 Answers

LaEvelyn

07/30/25 5:55am

The normal voltage range of a car alternator after starting is "15.3V-12.8V"; below is relevant information about car alternator voltage: 1. Normal alternator voltage conditions: When the vehicle's air conditioning is operating and other electrical devices are used excessively, the alternator voltage may drop below 12.8V. At this point, the vehicle draws current from the battery and cannot charge the battery. After starting, the battery voltage is essentially equal to the alternator voltage, differing only by the line loss voltage from the alternator to the battery. When the vehicle is not started, the normal battery voltage range is 13.8V-12.8V. 2. Introduction to the alternator: The car alternator is the main power source of the vehicle. Its function is to supply power to all electrical devices (except the starter) when the engine is running normally (above idle speed) and simultaneously charge the battery. Based on the three-phase stator winding of a conventional AC generator, additional winding turns are added with lead-out terminals, and an additional three-phase bridge rectifier is included. At low speeds, the output is from the original and additional windings in series, while at higher speeds, only the original three-phase winding provides the output.

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