How to Determine if the Generator is Faulty?
2 Answers
To determine whether the generator is faulty, follow these steps: Start the engine to keep the generator running and use a multimeter to measure the battery voltage. At this time, the battery voltage should be between 13-14.8V, indicating that the generator is in good condition; if the battery voltage remains unchanged after turning off the engine and stopping the generator, it indicates a problem with the generator. Relevant information about the car generator is as follows: 1. Introduction: The car generator is the main power source of the vehicle. Its function is to supply power to all electrical equipment (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 conventional AC generator, the number of winding turns is increased, and lead-out terminals are added, along with an additional three-phase bridge rectifier. At low speeds, the output is provided by the original winding and the additional winding in series, while at higher speeds, only the original three-phase winding provides the output.
I usually pay the most attention to signs of alternator failure when driving, and these symptoms are quite obvious. For example, if the battery warning light on the dashboard stays on and doesn’t turn off after the engine starts, it indicates a problem with the charging system. Dimming lights are another major signal—if the headlights at night appear less bright than before, or if the interior reading lights and radio sound weaker, it may suggest insufficient power supply. Difficulty starting the vehicle, feeling like the battery is almost dead when the battery itself is fine, points more toward the alternator. If the air conditioning or audio functions suddenly weaken or fail while driving. Once these signs are noticed, it’s best to visit a professional shop to test the alternator’s output voltage, which should normally be between 13-15 volts. Addressing the issue early can prevent roadside breakdowns—safety first, don’t hesitate to get it repaired.
