My new to me Bennington came with three batteries. One is at the stern while they other two are stored and connected at the bow, each in there own compartment on the port and starboard sides. At one time their was a trolling motor on the bow, the front battery (s) obviously powered it. Without crawling around and trying to trace how or if all three batteries are connected, I thought I'd ask the knowledgeable members here if they knew how the three battery system works. My main question would be, do all three of these batteries get charged while the boat is operating? I do have a battery switch at the back but it is only an off/on switch, their is no single or dual setting. Any information is helpful and likely saves me time. Thanks in advance.