New Dual Battery Set Up

[PARAGON]

Drty, it looks like the original POS cable that goes to the little red box is only hooked to one battery and not to the isolator. It seems to me that you would only get the cranking amps available from the one battery and not both.

When you switch, does the available power from both batteries exist at both batteries' positive posts or does the combined amperage only come available from the isolator? I know what I am trying to ask, I am just not sure I am conveying my question very well.