ive got 2 brand new 140AH batteries yet to install.
Id like to make them like a big battery so connect them up.
i know it seems dumb to most , maybe but i dont wanna fry any more batteries!

I also need to connect my panel to these batteries and my outboard charging wires.
whats the best/right way?

Ive also got a battery switch which im thinking to only have as an on/off, rather than select between the 2 batteries as they will become one battery. How does this all work!