No 12v Power - Abbey 418 Twin Axle 1991

by Steve
(Norfolk)

Hi, I am hooked up to mains and all sockets and mains lights are functioning fine. Battery is charging, full battery too.

However I have no power to 12 v system.. Switch also set to caravan... Is there a hidden fuse somewhere? Or am I just am idiot? Very frustrating, any help appreciated

Thanks in advance
Steve