« Reply #1 on: 02 April 2023, 22:25 »
Chances are they’ve connected the power to the fuse box (on the near side dash side accessed when the front passenger door is opened if it’s anything like the mk7) via a piggy back or using a spare fuse socket.
If you remove the fuse box cover you’ll likely see the cable dropping down from under the A pillar trim.
Just a guess mind you, someone else may well have better info.

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