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You don't say what type of RV you have, so my answer is generic. Most RVs have two battery systems, "house battery" for living amenities (fridge, interior lights, furnace, water pump, etc.) and a second "chassis battery" for driving functions (engine start, exterior lights, wipers, etc.) Ground connections are generally the same, the positive terminal is never cross-connected between the two battery systems except when a charging voltage is detected.
Speaking from over 15 years of RV experience (including 7 years of professionally delivering them from factories), truthfully, you should avoid the 12 volt function on an RV absorption type fridge. The dirty little secret RV dealers never tell you is the 12 volt function on a 3 way fridge, is not a useful option and more of sales feature. They draw a LOT of power so if you forget to switch to propane or shore power when arriving at the campsite, you will kill the house battery in no time. If you are stopped for any length of time and still hooked to the tow vehicle, you may also kill your tow vehicle battery too. And if your tow vehicle 12 volt power supply wire is not functioning properly, you will kill the house battery, while travelling. A much better solution is to pre-cool the fridge at home before departing, by connecting to the house power overnight. Put some freezer packs in the freezer compartment and they will keep the fridge cold. I know this does not answer your question, but trust me, this is the best route. Happy RVing!
Want to install split unit aircon in my caravan but see it only has a 16amp breaker, would this be able to run fridge, kettle and aircon at the same time?
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