How to connect 2. freezer?

2 hard 2 work out if there is 2 freezers or 2 batteries or 2 Karls or 2 x2 connections

I think the poster has English as a second or third language or no English and perhaps using an on-line translator and also using a foreign language keyboard. My guess is the "2." and perhaps the odd "?" characters are weird foreign characters "interpreted" by the EO forum software.

If you remove those it starts to make sense, allowing for poor English.

He's referred to "carbattery", so that is possibly the cranker. So "masterbattery" is possibly the second or house battery.

So I'll have a go at a translation:

"Hi
question is how to connect freezer on a tray box with slide on camper."

Perhaps the freezer (or perhaps fridge) is to be installed in a box on the tray of a truck/ute, but outside and independent of the slide-on camper. How do I connect it given the following two scenarios?

"Standard: Slide on on tray ? Masterbattery powered 2. freezer."

Normal situation the slide-on camper is on the vehicle tray and he wants the freezer (perhaps fridge) to be powered by the house battery.

"Exception: without slide on ? 2. battery under bonnet has to power 2. freezer."

When the slide-on camper is not present, he wants the crank battery to power the freezer (fridge).

"So the 2. freezer has two current inputs; from masterbattery and 2. carbattery."

So there needs to be a switchable or selectable power source for the fridge

"How and with what part will this works?"

How do I wire that up?

A common enough question often asked here.

Thank you. I really appreciate your interpretation. It´s 100% correct.

You are welcome, Kurt.

If you will be travelling our wide, brown land I hope you enjoy it as much as we who live here do. There is so much to see!

Cheers

Thank you Allan. Thats what I wanted to know.