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What are the reasons for the car headlight low beam not working?

1 Answers

VonSpencer

07/30/25 6:08am

There are mainly the following situations when the car headlight low beam is not working, which are: 1. The low beam bulb may be faulty. 2. The low beam control switch may be faulty. 3. There may be a fault in some circuits. Extended content: Troubleshooting methods for car headlights not working: 1. Check if the fuse is blown: Use a screwdriver to connect the dimmer switch live wire to the high and low beam terminals respectively, and observe the following situations: (1) If all lights are on, it indicates a fault with the dimmer switch. (2) If the high beam is on but the low beam is off when connected, the fault lies between the dimmer switch and the headlight or between the dimmer switch and the low beam. (3) If the high beam is not working, check if the high beam indicator is on. If it is, the fault is between the terminal block and the headlight; if not, the fault is between the terminal block and the dimmer switch. (4) If only one headlight is working and the other is not, it may be due to a burnt filament, an open circuit, or poor grounding. 2. The car light bulb is burnt out (1) The voltage regulator is faulty, causing excessive voltage. (2) Poor contact of the battery terminals, resulting in excessive no-load voltage from the generator. (3) There is a short circuit between the generator armature and the field coil.

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