I want to run a cable from my main battery to an Anderson connector in the cargo area of my 2005 Subaru Outback, to support charging a secondary battery. The secondary battery will be in a removable battery box so I can take it out for camping.
I will put an inline 40A fuse near the battery. The battery will be charged via a 20A DC to DC converter.
What is the best route for the cable to take from the battery to load area?
What is a good grounding point in the load area for the other terminal of the Anderson connector?