i have a 2003 Hunter 306. Noticed that no matter what battery i place the selector to 1 or 2 the motor will start start. I had thought it was set up as batt 1 for house and batt 2 for start. i know there is batteries set as series and parallel. i believe the current set up was the cause of two prior stranding events after a long sail. fortunately i carry a battery jump kit that saved me from a tow. any ideas as to how to separate the batteries please.