Ok , your coach being a lot newer than mine , this is a shot in the dark .
There is a factory installed , chassis battery maintainer, solar panel on my coach that is not wired to the battery , it's wired to the Newmar installed front fuse panel , and so when the batteries are disconnected from that panel , the solar charger , powers up some items that take their power from the front panel since it can't charge the battery. If your coach has a similar solar panel you'll have to find and pull it's fuse to get everything to shut down.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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