You said you are plugged into shore power...50a. If the battery switch is on then your converter should power all the 12v systems without batteries. I had to put a new converter into our 2018 last summer. You might check the output to see if it's working correctly. My batteries were also bad so I replaced them as well but ran the coach a couple days without any batteries installed with the new converter.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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