> I'm sorry, but it is clear that you have no idea what you are writing
Yup i am still puzzing this out a bit thick i guess :(
and no experince with these systems,
 I guess i should put a volt meter in here to see what realy happens
instead of these hought experiments :)
> about. The 2 batteries are connected in parallel when a relay or
> separator is used. The alternator charging current to the aux battery in
> no way passes through the primary battery.
the current does not pass through the primary but it must pass
across the + terminal of the primary battery BUT the primary battery
does not draw that current because it does not need it ...
thus it is not subject to the over charge condition as i believed

is this an accurate statement ?