3 way fridge question

Hi all, recently purchased a Coromal caravan, 2004 model. It has a 3 way fridge in it, but curious as to how the fridge runs on 12 volt.. am I correct in thinking it only runs on 12 volt while the vehicle is actually running, once the car is turned off, the power to the fridge stops?.. I have a bcdc1240 under the bonnet, and a third battery wired in to the Anderson plug. The Anderson plug is constantly "live" at the back of the car.. in the caravan is also a bcdc1220 redarc hooked up to 2x105 ah full rivers... just wondering if it all senses that the Anderson plug is live even when the car is turned off, should it all keep running, including the fridge and the bcdc1220, or is that not enough without the bcdc1240 under bonnet boosting the system.. sorry if this sounds confusing, just trying to understand it all.. thanks all.. Odog
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