"Dave" wrote in message
...
On Sat, 03 Jun 2006 23:13:31 GMT, "John Cairns"
said:

Or that you forget to switch the batteries after the engine is started,
and
don't charge either battery properly, overcharging one battery and
undercharging the other.

Why do you think that not charging the second battery will result in
overcharging the first? I would have thought that a well built system
would
prevent overcharging even if you had only one battery.

You can not overcharge a battery with a properly functioning alternator.

Deck Gorilla