If you had activated the coach battery disconnect, you would have to catch it in the act, but that sounds like a delayed re-connection of the disconnect relay for the coach batteries.
Or low power supplied to it's connect wiring, that is overcome by the alternator output.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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