There should be slight differences in the battery bank voltages , at either side of the battery isolation solenoid ( relay ) when it isn't activated and the voltage will be the same when it is .
Do you know what isolation system your RV uses?
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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