Drivers often request the following lighting problems. When the low beam switch is turned on, one lamp emits light normally, and the other lamp emits darkness, while the high beam filaments on both sides also faintly emit dark red; while the high beam switch is turned on, the original lamp with normal light emission is normal, and the high beam emits light. It is normal, and the low-beam filaments of the two lamps glow at the same time and the high beam filament of the other lamp emits a dark red color. Since the situation shows that the filaments can be energized, it is generally suspected that the power cord is damaged or the switch is in poor contact. In actual fact, the cause of the malfunction is that the lamp that has been lighting is not normal is bad. This is because the two headlamps are connected in parallel. When a ground circuit is lost, the low beam or high beam switch is turned on. The current can be used in series with the two filaments of the lamp and the unlit switch of the good lamp. A good lamp's ground forms a complete circuit; however, the total resistance of the series filament is much higher than that of any single filament, so the light is dimmed but the light is dim. Incidentally, the above-mentioned light emission performance is described in terms of the power of the near and far light. If the power is the same, three filaments that do not emit light normally have the same degree of dimming.
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