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It sounds like you didn't have 12v going from your truck to the Rv. Otherwise it will run indefinitely whike hooked to the truck 12v & atleast 1 good agm battery. Also in 2018-2019 & maybe beyond they used a auto transfer switch to power the fridge. If on shore pwr it will switch to that & if no shore power it switches to the inverter power. Mine works seamless since I figured out that my 12 truck supply had a blown fuse.
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