Yes, this is very helpful to somebody in the future, as I'm about to do the exact same thing.
But I have a couple of simple questions to make sure I'm seeing it right.
1. In the diagram in the above post, the red lines... I would leave the battery cables connected to the BCC, and run short cables to the BIM terminals?
2. Suppose I didn't connect the blue wire to the ignition. That should mean that the house batteries would charge the chassis battery when on shore power or solar, but the alternator would not charge the coach batteries when the engine is running. With solar power, I might not need that.
3. I thought we disconnect the control leads to make the solenoid permanently open. I don't understand why the yellow wire leads to the solenoid... it seems I should connect to the wire that was removed from the solenoid, which is controlled by the dash switch. Is that it?
Appreciate if somebody could confirm that I'm seeing this right. And thanks for the above drawings/notes. I was very confused at first, but if my assumptions in 1-2-3 above are correct, this will be pretty easy.