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If both your lights work then someone wired the second light to work, because it does not come that way.
Why is there a bulb in a socket when there is no power to the socket? Never seen this "extra" bulb on a US car. On the German and UK boards I have seen reports that their cars come with this extra bulb. They treat it as a spare bulb.
Why there is a socket that does not work is simple. Porsche can use one bulb holder for the world and depending on LHD/RHD there can or cannot be power to the socket depending on how the car is wired.
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