"Rod McInnis"
The easiest thing to do (and best in my opinion) is to use a pair of
"battery combiners" to connect the stereo battery to the other two
batteries. The combiner monitors the voltage on the batteries, and if it
sees a voltage high enough to indicate that charging is taking place
(~13.5
volts) then it connects the two batteries together so they both charge.
It
doesn't matter if the source of the charge is the alternator or battery
charger. Its simple, automatic, easy to install and foolproof.


Sounds like a plan!

Thanks!

Glenn