I just went from a 12 trolling motor to a 24 and at the same time had a 3 bank charging system installed. When I got back from fishing yesterday I pluged the charger in and all 3 batteries were at the same low level, and took the same time to recharge. In the past, my main battery was alwys almost fully charged when I put the single charger on it. It seems to me that the trolling motor might be pulling from all 3 batteries. Does that sound like a possibility? There installing a couple of depth finders for me this week and I want all problems to be taken care of at once. I'm having the depth finders run to the main battery to eliminate any interference possibilities. I just don't want everything pulling from the main battery and get stuck in the swamps with a dead starting battery.