So I have been searching our forum for triple battery setup's. As we get our camper in a few weeks and need to prepare the car...Read a fair bit but just want to ask to make sure I have it correct as per my current setup of what I have.
I have the cranking battery, connecting to the 105AH deep cycle aux battery via a Redarc SBI12 isolator.
Is it best to run the cable down the back of the car from the cranking battery or the auxiliary battery? I was first under the assumption its from the cranking battery, then I found a thread where it was from the auxiliary battery.
I have some 6B&S cable here I will use....

Cheers.