What to do if my car's dipped headlights keep blowing UK?

If your car's dipped headlights keep blowing, it's most likely due to a faulty relay, voltage regulator issue, or incorrect fuse rating. For UK drivers, first check the headlight relay with a multimeter - if there's no 12V output or constant output, replace the relay.

Common reasons for dipped headlight failure in UK cars (like Vauxhall Corsa, Ford Focus or Mini Cooper) include:

1. Faulty alternator voltage regulator - if voltage exceeds 14.4V, replace the regulator or entire alternator
2. Incorrect fuse rating - use manufacturer-specified fuses (typically 10A-15A for most UK models)
3. Loose bulb connections - check for corrosion or overheating at the connector
4. Poor quality bulbs - stick to reputable brands like Osram or Philips

For modern UK models (2020+) with LED headlights (such as Tesla Model 3 or BMW i4), consult a qualified technician as these systems require specialist diagnosis. Always refer to your vehicle's handbook for specific bulb replacement procedures to avoid voiding warranty.