How Often Should a Car Alternator Be Replaced?
2 Answers
Car alternators generally need to be replaced every 15 to 20 years, depending on actual usage. Below is some relevant information about car alternators: 1. Function: The car alternator is the main power source of a vehicle. Its role is to supply power to all electrical devices (except the starter) while the engine is running normally, and simultaneously charge the battery. 2. Structure: Based on the three-phase stator winding of a standard AC generator, the car alternator increases the number of winding turns and adds lead-out terminals, along with an additional three-phase bridge rectifier. At low speeds, the output is from the original winding and the additional winding connected in series, while at higher speeds, only the original three-phase winding provides the output.
Automotive alternators generally don't have a fixed replacement interval and only need to be changed when actual failure occurs. Having driven for over a decade myself, I've found their lifespan typically ranges between 100,000 to 150,000 kilometers, depending on driving habits and vehicle model. If you frequently make short urban trips, the alternator wears out faster because the battery may not get fully charged, and repeated cycling can lead to issues. Main symptoms include the dashboard battery warning light illuminating, difficulty starting the vehicle, or malfunctioning electronic devices. I recommend not waiting until symptoms become severe - have technicians check the output voltage with a multimeter during each maintenance service to ensure it remains stable between 13.5 to 14.5 volts. This preventive approach can avoid major breakdowns and save you from tow truck hassles.
