Piggy away !
The switch is at the base of the lower cabinet, on the left hand side, as you walk in. If you have the assist handle on the same side, it is around where the bottom section bolts into the wall.
I've noticed that calling it a disconnect isn't real accurate, as it sounds like it throws a solenoid. But my interior 12V lights still work.
I have mine in a garage with 120VAC. I have a maintainer on the chassis battery, or is it batteries. To tell you the truth, I haven't even checked. I do have 2 - 12VDC coach batteries and noticed that even if it's not cold out, they were pretty much discharged within a couple of weeks. I plan on just disconnecting them and using a maintainer on them.
I've done the same with my original Class C and then with the 5th wheel I had, before we bought the Siesta. The only difference was that on the 5th wheel I used to pull the battery out at the end of the season. I was just easier with how the battery compartment was configured. I just need to buy another battery maintainer.
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