What are the reasons for both high and low beams of car headlights not working?

[LeoRose]

Car headlights not working for both high and low beams may be due to a blown fuse or burnt-out bulbs. Here are the specific reasons: Check if the fuse is blown: If all lights are on, it indicates a failure in the dimmer switch. If the high beams are not working, check if the high beam indicator is on. If it is, the fault lies between the terminal block and the headlights. If not, the issue is between the terminal block and the dimmer switch. If only one headlight is working while the other is not, it could be due to a burnt-out filament, an open circuit in the wiring, or poor grounding (dim headlights). Burnt-out bulbs: The voltage regulator may be faulty, causing excessive voltage. Poor contact in the battery cables can lead to excessive no-load voltage from the generator. There may be a short circuit between the generator's armature and field coils.