a. Yes, the 1314 will allow charging of both only if the charger is on
the starting battery. If you put the charger on the aux battery only the
aux battery will get the charge.

b. The 1315 will allow charge to both no matter which battery has the
charger hooked to it.

c. If the battery you connect the charger to is drained low enough it
will be the only battery charged at first but as it fills up at some
point the 131x will share the charging with the other battery too. That
of course is governed by (a) and (b) above.

d. The (a) statement above assumes a normal dual battery setup with the
1314 meant to share alternator charging with the aux battery.

Mark

Dan N wrote:
> hi Dennis,
>
> according to the manual the 1314 will charge the aux. battery when the
> voltage reaches 13.5V. The question is if use a charger like this one on
> the main battery
>
> http://www.autozone.com/test-scan-and-specialty-tools/battery-charger/schumacher-10-2-amp-fully-automatic-manual-battery-charger/988_0_0/?checkfit=true
>
> the aux. battery will be charged too or only the main battery..
>
> thanks
>