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

[kendgb]

My #765 Has a 30 amp slow blow in line  fuse in the red wire to each battery from the charger. It is a few inches from to the battery post.   A blown fuse in #1 line recently caused me some trouble shooting issues when commissioning my solar panels which used the charger line to take power from the solar controller to the battery.Fuses were shown in the wiring diagram and easily found near the batteries.Ken GeigerNorthern Dream Sent from my Samsung Galaxy smartphone.
-------- Original message --------From: Dean Vermeire <dean at vermeire.us> Date: 2020-08-08  17:20  (GMT-05:00) To: C320-List at Catalina320.com Subject: [C320-list] Riddle me this - a battery charger question 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