[C320-list] Riddle me this - a battery charger question

[Dean Vermeire]

I recently replaced the old charger with a ProNautic 1230P.  I have two 
4D batteries in the original configuration in a 2001 320 (#847).  Both 
of the batteries have positive cables from the charger.

The problem is that if I leave the boat at the marina with the battery 
selector switched to batter 2, the battery runs down, even though the 
charger is on.  This was true with the old charger, as well.  So, at 
least I haven't made things worse.

Now, the fact that the battery runs down (the only load was the 
refrigerator, which was running) tells me that it is hooked up to the 
selector switch.  The negative terminal is tied to the negative of 
battery 1.  The charger's positive cable is hooked up.  The charger's 
negative cable is to the common ground.  The charger works and charges 
battery 1.  It also charges battery 2 when the switch is on both.

What on earth am I missing?

Dean Vermeire

#847