Got a buddy thats dead set on doing a dual battery set up. So he sends me a drawing of it. Its not set up like any other dual battery write up ive looked at. Just want to run it by a few of you guys that have done dual batteries and done plenty of research and see what you think of it and whether its a good plan. Dont want him to burn his truck down, leave him stranded, or not do what it he intends it to to do.