Very good and readable link.
A postscript to my earlier entry in this post.
It appears my dropping voltage is the result of a non working - off position, in my 12V compressor fridge, not a decaying battery as I suspected.
I caught the culprit starting up, whilst cleaning the MH this afternoon. Ive pulled the fuse and will need to check the voltage again every 24hrs for the next few days to confirm.
Posting to let other know, OFF, isint always off when applied to an ( admitedly 12yr old ) fridge.
John & Helen
Hilux 3lt diesel towing "Lilys Pad" (X-treme 273, 5th Wheeler). CAP - 8683 at holidayhouses 48371.
Adventure is not in the guide book and beauty is not on the map, seek and ye shall find.