Welcome to iRV2.
I'm not sure about your charging system , but on my coach ( BIRD, multi battery bank, charging control) will not interconnect the chassis and coach batteries for charging, from the converter/charger, until the coach batteries are fully charged ( over 13.2v for two mins)so your system may be prioritizing the coach batteries, until they are fully charged; and that could take a day.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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