I recently purchased a 1988 Cat30 and am trying to understand the electrical bits. She has two batteries and the standard 59 amp alternator on the universal 25x diesel and a solar panel charging the no1 battery. The original owners manual tells me to switch the battery switch on 'ALL' to start the engine and keep it there, but that you can charge each battery separately (but doesn't give any further details). A previous owner has inserted a manual note advising to start and run engine on battery 1, and switch to '2' when the engine is not running (clearly suggesting to use '2' as house battery, there is a 12v fridge etc)That's where I am confused and I have the following questions (I noticed a similar thread in the archives, but didn't quite understand the answers...):1) when switch is on '1', does engine charge battery 1 only and NOT battery 2? 2) if so, shouldn't one charge on 'ALL' and switch to '2' when the engine is not running, to keep '1' charged for starting the engine?3) The manual warns not to change from 1 to 2 or all whilst the engine is running - is that one of those 'catch-all' warnings or has it substance?4) Is the standard 59 amp alternator a multifase one - I think not: is there any danger of overloading when motoring, and therefore cgarging, for extended periods?Hope you don't mind I pick up an old thread - but this bugs me no end...!thanks for any help,Edward.