I have been told that you can run all your 12 volt extras (lights,stereo,fishfinders,etc) off of one battery even while it is connected to another battery to supply 24 volts to a trolling motor. If this is correct can you also run the batteries in parallel so the 12 volt system will drain the batteries evenly? (Series for 24v and parallel for 12v at the same time)? ( hope I have my terms correct Series/Parallel?) If not I guess I could put a battery selector switch in to choose which battery I get my 12v from. Thank You!