On my Georgetown, I can turn off the battery disconnect and any lights inside will go out. If I hook up to shore power, the inside lights will come back on including the light on the battery control switch.
So, it appears that, at least on my coach, the battery disconnect is bypassed when charging.
Life is a journey, not a destination.
2005 Georgetown 359ts
Bill & Virginia, Kentucky
Nights camped in 2011...78 , 2012...73,
Nights camped in 2013...123, 2014 ...101