They probably are straight forward, I'm just a bit dim I'd imagine!
There is a red 'switch' - it's more of a turnkey-type thing really - on the inside of the passenger seat which seems to connect to the battery under there (I presume that's the leisure battery but again, I know nothing about these things!) which I have no idea about.
Also, on the dash, there is a little flick switch which lights up when it's down (I presume 'on') and again, seems to make no difference to anything but I presume it must do!
Apologies, didn't have time to get pictures but will do my best to get a couple this evening!
Thanks - it's hugely appreciated - we're new to campervans as we could only afford ours (Klaus) due to the generosity (or otherwise!) of our wedding guests!
We love him, but are very uneducated about him and are trying to find out more as it's difficult to find manuals etc as he's so old.