So Dennis---just so I'm sure about this---a smart separator like the
Surepower 1315 connected to the aux battery will allow both batteries
to be charged in BOTH directions--from either the engine alternator
OR a single 120V charger also connected to the aux battery. Thanks.

Jeff

On Mar 11, 2006, at 6:24 PM, Automatic digest processor wrote:

> This is where smart charge separators or combiners come in handy. You
> connect the charger to the auxiliary battery. As the battery is
> charging, the combiner will sense the voltage increase and connect the
> main battery now allowing both to be charged. It works the same
> when the
> main battery is charged from the engine alternator to charge the
> auxiliary battery.
>
> Dennis