It seems this relates to issue in this thread .....
I hooked up my T7 Cali Ocean (diesel) today as both batteries were a little depleted. Checked some hours in and it had charged them but not quite completely - so left for a few more hours. When I went back the display by the rear door said that the 2nd batt was at 5V and a notification said "the campsite power supply is currently unavailable".
The mains from that socket is fine and unless he cable has developed a fault while being hooked up that is fine too.
The circuit breaker had not been activated.
Now I had an issue which required VW breakdown to come and start the van some months back as the vehicle battery was completely depleted (had to use manual key to get in) after 3 weeks unmoving.
Presumably I have to contact the dealer ... but it's 200miles away!
