I recently purchased a Minn Kota onboard charger model 330D. I am ready to install it and need to know if it makes any difference which lead I hook to which battery. I have a 12 volt battery that is a stand alone for the outboard motor and two 12 volt batteries hooked up in series for my 24 volt trolling motor. Also I need to know if I need to unplug my trolling motor whenever I charge the batteries. The owner's manual doesn't say anything about how to hook the charging leads up. I Emailed Minn Kota a couple of days ago asking these questions and have not gotten a response. Thanks