Some of the automatic charge control relays (ACR) will work both ways. I am not sure of the 1314. I know the 1315 does. You do want to consider how that "household" (whatever that means) is designed and operates. "Lid" (highest voltage reached-maintained during cycle), voltage and ripple are things to be considered when charging batteries that are connected. Battery off gassing inside the vehicle should also be considered. Some chargers will top off as high as 17 volts. Some electronics including your engine ECU may not like that. 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Dan N
Sent: Saturday, April 23, 2016 8:46 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Charging the batteries..

hi all,

on my '88 Carat I have an aux. battery wired to the main battery via a Sure Power 1314 Separator...

if I hook the main battery to a 10 Amp household battery charger, will it charge both battery or only the the main battery?

thanks

dan