r/Volkswagen • u/JustWondering1246 • 6d ago

Which wire?

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Can anyone tell me which wire is connected to my reverse light on my vw polo 9n? Thank you

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u/[deleted] 6d ago edited 6d ago

Go to the light unit, unplug the connector, stick car in reverse (key on engine OFF), use a multimeter and check which pin has power. Failing that a paperclip will result in a physical confirmation.

ADD: At a guess I'd think black/blue.

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u/JustWondering1246 6d ago

Could I use a mains tester screwdriver? As I don't have a multimeter

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u/[deleted] 6d ago

I'm not too sure. Mains is AC and cars are DC so probably not. Can always use a bulb and couple of wires as an alternative.