I'm not sure if I have a BIM on my ACE, but I did have an similar interesting problem that I traced down to my Emergency switch. I had also installed a battery disconnect switch on the negative pole on my batteries and was having an issue with lights in the coach still working with the disconnect switch in the disconnect position and the Use/Store switch in Store.
I tried toggling the Emergency switch and the problem went away. Best guess is that something hung up (BIM or BIRD - now I have to chase that down) and that a either a return path to the frame was being provided despite the switch at the battery being open or the chassis battery was actually proving power to house battery circuits. Toggling the Emergency switch cleared that problem - at least for awhile. I haven't noticed the same behavior again.
One very positive aspect of having solar on the roof now is that I'm no longer concerned about the fugitive loads that still might be on when the Use/Store switch is in Store. I do set the Use/Store switch to Store, but don't bother with the disconnect any longer.
The solar bypasses everything and keeps the batteries topped off all of the time. I've been watching the battery water levels and got through the winter without having to top any of the cells off and a hydrometer says they are all great.
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Rick
2017 Thor ACE 30.1
2017 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain
RVi Brake 3
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