If we did connect the external supply in series with the vehicle battery then we would be applying 24 volts to the electronics.
My battery problem was due to a dead cell. A drop test proved this after we had removed it from the car.
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Ray at Wigan Pier
2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore..
In progress, Nothing left to do.
Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter)
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