When I have the ignition switched on, if I press the brake pedal, or use the headlights, the foglight gets turned on.

I think this is an earthing issues so I have checked the grounds in the two light clusters at the back, but I am not sure where the headlight clusters are grounded, or what else to check.

EDIT : I remade the main earth on the engine, and now the problem only affects the indicators. So the foglight blinks with the indicators.


It certainly sounds like an earthing issue, but I doubt it would be in the headlight clusters - I'd expect it to be in the rear lamp clusters somewhere.

IIRC the Golf has a combined tail and brake lamp, so both filaments will use a common ground. Generally rear clusters earth through a pressed metal frame that forms part of the bulb holders (as the bulbs return through their shells, and a single connection to the car body shell.

  • That was my first thought also, so I checked and remade both grounds on the rear light clusters. This didn't solve the problem though. – Tom Macdonald Aug 22 '13 at 9:29
  • 2
    Found it! The earth tab on the rear left light cluster connecter had burned almost through. I remade it by soldering a new wire to the earth connection inside and connecting it to the rest of the earth wire. – Tom Macdonald Aug 23 '13 at 9:55

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.