uk Transport & mobility emergencies headlights not working • rear lights not working • tail lights out • brake lights check • lights failed before night drive • realised just before driving • driving at night lights broken • car lights suddenly stopped • dipped beam not working • main beam not working • sidelights only confusion • auto headlights not turning on • daytime running lights only • blown fuse lights • bulb failure headlamp • both headlights out • both rear lights out • number plate light out • car lighting failure • night driving visibility

What to do if…
your headlights or rear lights stop working and you realise just before driving at night

Short answer

Don’t drive on public roads at night if your headlights or rear lights aren’t clearly working. Park up, make the car visible while stationary if needed, and switch to an alternative plan or get help.

Do not do these things

Don’t assume daytime running lights (DRLs) mean your rear lights are on — they often aren’t.
Don’t “make do” with sidelights/parking lights instead of proper headlights at night.
Don’t drive “just a short distance” on public roads hoping it’ll be fine — it’s unsafe and you can be stopped.
Don’t keep toggling switches while moving to “see what works” — do checks while stationary.
Don’t let someone stand in the road behind the car to “check the lights” in traffic or low visibility.

What to do now

Make a safe pause first.
Stay parked somewhere safe. If you’re already stopped in a place where other drivers may not see you, turn on hazard warning lights while stationary and move yourself (and the vehicle, if you can do so safely) out of any live lane.
Force the lights on (don’t trust Auto).
Turn the light switch to ON (not Auto), then check: dipped beam, main beam, rear lights, brake lights, indicators, hazards, and the rear number plate light.
Confirm it’s not an “Auto/DRL” trap.
Walk around and confirm rear lights and number plate light are actually lit (rear lights matter as much as headlights at night).
Do a quick “one side vs both sides” check (helps decide whether to stop).
- One headlight out / one rear lamp out: often a bulb.
- Both headlights out / both rear lights out: more likely a fuse/relay/switch/electrical issue — treat this as do not drive tonight.
Only try the simplest, user-safe fix in a safe, well-lit place.
Use your owner’s manual to locate the relevant lighting fuse. If you can safely access it and have a spare, replace only with the same rating. If you’re not confident, don’t have the correct part, or it doesn’t work immediately: stop and arrange help.
Choose the low-risk option: don’t drive; change the plan.
Use a taxi/public transport/lift, or wait until daylight. If you must move the car, do so only on private property (e.g., driveway).
If you’re away from home, arrange recovery/repair rather than driving unlit.
Contact your breakdown provider/app or a local garage. If you feel unsafe where you are, it can be safer to remain in the car with doors locked while you arrange help (where that’s the safest option).

What can wait

You don’t need to diagnose the exact electrical fault tonight.
You don’t need to decide whether it’s wiring, alternator, or a control module issue right now.
You don’t need to book a full inspection this minute — first priority is not driving unlit at night.

Important reassurance

It’s common to notice a lighting failure right before setting off. Pausing and changing plans can feel frustrating, but it’s often the quickest way to prevent a crash, a stop by police, or getting stranded somewhere darker and more dangerous.

Scope note

These are first steps to keep you safe and prevent a bad decision right before a night drive. Proper repair may need a mechanic if it’s more than a bulb or fuse.

Important note

This is general safety information, not legal advice or a substitute for a mechanic’s inspection. If you’re unsure whether your lights are working correctly, treat that uncertainty as “not safe to drive” and choose an alternative.

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What to do if…your headlights or rear lights stop working and you realise just before driving at night