I have a 18' 1986 ranger 350. the guy that sold me the boat said that the trolling motor and aireator and the bilge pump and the lights ran off of the 2 trolling batteries but after looking and digging around I find that everything runs off of the starting battery except the trolling motor. the 2 batteries are wired for 24 volts and my trolling motor will run off either voltage 12 or 24. last time my wife and friends went camping for 3 days we got stranded out on the lake because of a dead starting battery. would it not be better to just wire the 2 trolling batteries in series to 12 volts so I can run everything to the 2 trolling batteries so it would save my cranking battery. whats the deal with 24 volts when most everything is only 12 volts. thanks guys