If I have understood it right he has additional cigarette lighter socket connected to the piggy back fuse and hidden it somewhere, then cigarette lighter USB adapter goes in that socket and USB cable to the camera.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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