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What causes low beams to not work?

What causes low beams to not work?

The likely cause is a fuse, headlight relay, headlight switch, dimmer switch or a wiring fault. About the only cause that is an easy fix is a blown fuse. Consult your owner’s manual to locate the main fuse for the headlight circuit and replace that fuse with one having the same amp rating.

Why would high beams work but not the low beams?

Headlight Fuse or Relay If a headlight fuse blows, it could cause the headlights to stop working. Most headlight systems are also designed with a relay that switches the power between low beam and high beam headlights. If this relay goes bad, it could allow power to the high beams, but not the low beams.

Why do high beams work but low beams don’t?

This is the most common reason we see for why a car’s high beam headlights work but the low beams don’t. The normal headlights are on far more often than the high beams, so the low beams burn out more frequently. Some vehicles have entirely different bulbs for the high beams, and other models have headlights with two different filaments.

Is it safe to drive with high beams on?

No one wants to be driving along at night and have their headlights go out. In many cases, the high beams will still work when the regular headlights stop, but it’s just not safe to drive around with your high beams potentially blinding other drivers.

Why do headlight bulbs have two filaments?

Most modern headlight bulbs have two filaments in the same glass enclosure: one for low beams, one for high beams. I imagine that you use low beams most of the time, so the corresponding filament burned out sooner. If you have this problem only with one headlight, I believe this is the reason.

What causes a headlight to stop working in a car?

All the electrical systems in your car, including the headlights, are protected with fuses. These are designed to ‘blow’ and break the circuit if too much power comes through them. This protects all the components on the circuit. If a headlight fuse blows, it could cause the headlights to stop working.

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