Got 25' of red and black 8 gauge copper wire, a 40 amp breaker and some lugs. I plan on wiring this truck correctly for the 12v frig. I hate to admit I never wired the three previous trucks correctl...
On the driver side battery in my Ram, there's a High Amperage Power Point (HAPP) that I installed a 60A fuse. The HAPP is just a threaded post that you can draw up to 300 amps from. I ran 4 gauge wire under the cab of the truck, through a plastic hole cover in the front of the bed, to the Pollak outlet mounted in the board that keeps the camper from hitting the top bed rail. The plug end of the Pollak connector is connected to 4 gauge wire that goes through a sealed gland into a Victron 12-12 30 amp converter inside the camper. 4 gauge wire runs from the Victron to the power center of the camper. Then 4 gauge wire runs from the power center to the 2 100 ah lithium batteries.