Mi Mick,
I am assuming from your description that your second battery is under the bonnet.
A lot of it depends on what you plan to do out the back there. If you just want to make use of the existing socket at the back for the fridge you could just steal the source from the main battery and use the second battery to feed it. I don't recommend this action as a fridge that large would likely stress the wiring and could lead to all sorts of nasty consequences.
In my D2 we "stole" some of the feeds in the main fusebox for a lot of the auxiliary stuff and replaced the feed with the second battery. For example all the lighter sockets, the courtesy lights and even the radio. The UHF and HF were fed direct from the second battery.
If you want to have more power in the rear compartment then a reasonable feeder from the second battery to a fuse box in the rear is definitely the go. That way you can figure out what you want, cable and fuse as appropriate, and put 'em wherever is convenient. I had a specific Engel socket for the fridge, two lighter sockets for low current things, and a 300W inverter for miscellaneous low power 240V stuff, out the back. That suited my needs. Yours will likely differ.
Don't skimp on the cabling. Better to over size the runs and fuse appropriately, than to under size it and risk the cable overheating, with all the inherent consequences.
Hope this helps some.
Cheers,
Iain
Iain
VK3BIT
03MY Range Rover HSE Td6
Nudge Bar, Sat-Nav, Cargo Barrier, IC-450, IC-706 and Codan 9350, DT-90 DBS, Chipped!
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