What are the signs of a failing car alternator?

[VonAdrian]

Signs of a failing car alternator include: 1. Constant illumination of the charging indicator light: When the charging light stays on, the alternator stops supplying power to the vehicle. Over time, the battery's energy will be quickly depleted. 2. Dimming headlights: The vehicle's lighting bulbs will noticeably dim. 3. Non-charging indication on ammeter: When the engine operates at medium or higher RPMs, the ammeter needle shows no charging activity. Relevant information is introduced as follows: The car alternator serves as the primary power source for vehicles. Its function is to supply electricity to all electrical devices (except the starter) while simultaneously charging the battery when the engine is running normally (above idle speed). Based on the three-phase stator winding of a conventional AC generator, automotive alternators feature increased winding turns with additional lead-out terminals and an additional three-phase bridge rectifier. At low speeds, power is output through the series connection of the original and additional windings, while at higher speeds, only the original three-phase winding provides output.