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All Symptoms

Headlights are dim or flickering

Needs attention soon

dim headlights at night · headlights flicker while driving

Symptom description

The headlights appear noticeably dimmer than normal, or flicker on and off slightly, especially noticeable at night or idle.

Common causes

  • A worn or aging bulb nearing the end of its life
  • A corroded or loose electrical connector at the headlight
  • A failing alternator not providing stable voltage
  • A ground fault in the headlight circuit

What to check

Check whether both headlights are affected equally - if only one is dim, a bulb or connector on that side is the likely first suspect.

Can you keep driving?

Usually safe short-term, but fix promptly if driving at night - reduced headlight output meaningfully reduces visibility and reaction time.

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Descriptions are for guidance only and do not replace a workshop inspection. If you are ever unsure whether it is safe to keep driving, pull over in a safe spot.

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