I'm the second owner of this Patrol and bought a Waeco 80L dual zone refrigerator that was put in the back to run off a ?Navara 12vdc plug. The plug was fine what I found was very small wire, 12-14ga AWG (sorry haven't converted that measurement yet) duplex wire was run from the second battery to the left rear panel where there was the plug non-cigarette type. So the vdc loop was long for such a small wire and the amps the Waeco took at startup and was blowing fuses.
I've done a lot of rewiring of boats and so I had a bunch of wire spools of various sizes with all the fittings. Even some stainless steel armor shielding picked up at the Boeing surplus store, say in '88-'89. Really used for RFI shielding in planes but also protects the wire from chaff, etc.
So the first picture is of the existing feed wire (small) and the feed cable from the Piranha isolator.
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So, I would run a larger 6ga AWG ANCOR to a split bus at the back door and then disassemble reassemble the small existing pair into one combined feed pair appropriately labeled since black and red would be joined.
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I also pulled out of the marine bucket some battery terminal covers which I installed after soldering/crimping the lugs on the ends of the two feed wires.
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Each circuit would be fused, 20a for the now duplex 12ga and 50a for the 6ga, a terminal hood would go over the positive to prevent shorts.
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And so this is what the rear AUX panel/wiring looked like before (I have split off the neg before taking the picture from the old neg loop)
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To this ... (used the frame as a ground at the left rear post)
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More to follow in DIY storage as my drawers finally were folded ..