I'm hoping forum members may be able to shed some light on this problem I'm having. The marina mechanic was unable to solve. He installed two brand new batteries on my 2000 326 aft cabin. He advised not to leave the battery charger on while it's docked on shore power for days at a time. When I leave the boat I shut off shore power two switch, and leave one on, with only the three bilge pumps and refrigerator left on. All the other switches in the off position.
Returning several days later my batteries are drained. The mechanic took a reading, one battery was very weak, the second completely drained. He replaced the dead battery and we were off and running. For only about a week or so. I discovered this past Sunday my batteries are dead again. This time I turned on the charger for a couple of days, but no luck, they are still dead. What am I doing wrong?