Clam Bake
Member
I think I read a long time ago in another thread.... there could potentially be an issue caused when changing the battery switch between both/1/2 while the engine is running? I can't recall exactly - but I am pretty sure I read only to switch battery settings "before" starting the engine? So if you have to start on battery 2 for example, is the alternator also charging battery 1 while the engine is running?