I'm just planning wiring for my van build and just wanted to confirm my understanding is right. I'll be installing 2 AGM leisure batteries at the front of the van, near the starter batt and will have all other electrical components at the rear of the van.
For DC to DC, I'm looking at using an non- isolated Orion 12 12 30 and was planning to wire as below.
Just want to be sure that I don't need to run a negative to the back of the van since the ground will take care of that for me? Is that correct?