> I�m having problems to charge the aux battery (due to a lack of plugs in
my
> building or service stations) and so, I started to think of placing both
of
> my batteries in parallel.

Javier... what are you saying? ... are your batteries NOT in parallel?
If they were hooked in series you would be running 24 volts through your
system... assuming you have 12 volt batteries like most of the rest of
us....

>
> My question is:  Do I have to change the alternator?

2 12 volt batteries in parallel should not be a problem on a 12 volt
system...
but it is best if they are the same size...

Bill

> If yes, at once or it can be delayed a while?
>
> Please give some advice, weekends are a nightmare without full charge!!!
>
> Javier Zavala
> 84 1,9L German  Westy
> 01 Prospector Hovercraft
>