The boat belongs to a friend. What’s the best battery & switch configuration to prevent killing cranking battery. 2012 2075 Lund, 225 Verado, 9.9 Merc kicker. After trolling for extended periods the cranking battery won’t start Verado. I’ve researched some, sounds like Verado power steering is the problem. I’m not sure what needs to be done to stop getting stranded. I know he just bought 2 new group 31 AGM Deka batteries. Where does he go from there? Drawings, schematics or pictures are very helpful🍻