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近几年来，发生在汽车电系的故障，尤其是照明系、充电系故障，呈上升的趋势，严重地影响着汽车的正常运行和安全行驶，所以驾驶人员和维修人员应予以高度重视，对此类故障严加防范、正确排除。1.故障现象a.夜间行车时开了前照灯后，前照灯在开始的2 h内较亮，但随后即逐渐变暗
In recent years, the fault occurred in the automotive electrical system, especially the lighting system, charging system failure, showing a rising trend, seriously affecting the normal operation of the car and driving safely, so drivers and maintenance personnel should be highly valued, right Such failures strict prevention, correct excluded. 1. Symptom a. When driving at night, headlamps, the headlamps in the first 2 h brighter, but then gradually dimmed