1. Using voltage range detection: When landing, turn the multimeter knob to the DC voltage range of 30V on the battery end, connect the red lead to the generator's "armature" terminal, and connect the black lead to the casing, allowing the engine to run above medium speed. The standard voltage value for the 12V electrical system should be around 14V, and the standard voltage value for the 24V electrical system should be around 28V. The voltage measured by a small car is generally above 13.8V, often reaching over 14V. If there is no power generation, the voltage will decrease significantly after landing, often falling below 12V. If the measured voltage is the battery voltage, it indicates that the generator is not generating electricity. 2. External ammeter detection: When there is no ammeter on the car dashboard, an external DC ammeter can be used for detection. First, remove the generator's "armature" terminal wire, Connect the positive pole of the DC ammeter with a range of about 2OA to the generator Armature ", the negative wire is connected to the above removed connector. When the engine is running at medium speed or above, the ammeter has a 3A-5A charging indicator, indicating that the generator is working normally, otherwise the generator will not generate electricity. 3. Lamp test method: When there is no multimeter or DC meter, a car lamp bulb can be used as a test lamp to detect. Weld appropriate length of wire at both ends of the bulb and connect a fish clamp at both ends. Before testing, the generator" armature Remove the wire connecting the pillar and clamp one end of the test lamp onto the generator armature Connect to the pillar and ground the other end. When the engine is running at medium speed, the test light on indicates that the generator is working normally, otherwise the generator will not generate electricity. 4. Change the engine speed and observe the brightness of the headlights. Method: After starting the engine, turn on the headlights and gradually increase the engine speed from idle to medium speed. If the brightness of the headlights increases with the speed, it indicates that the generator is working normally, otherwise it will not generate electricity. 5. Remove the battery grounding to observe the engine Whether the motivation works: When there is no microcomputer controlled electronic device on the car, this method can be used to detect. Control the engine above medium speed and remove the battery ground wire. If the engine is working normally, it indicates that the generator is generating electricity, otherwise there may be a malfunction in the generator