I have Ranger z21 2005 Mercury Verado 250 and I have 3 batteries. One for big motor verado and 2 for trolling motor 24v. Some times I got low voltage, all my accessories is connected on staring battery, I have battery switch for 1,2 and all batteries. Can somebody tell me best setup for batteries on mercury verado and all accessories? Thank you in advance and sorry for my bad English