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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.

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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.

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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
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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
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