How does the switch in the battery compartment work?

Cooncatz, one other thing...you mentioned the switch in the battery compartment, but the switch you are referring to, at least in most motorhomes, is located at the top and on the side of the cabinet as you enter the side door, on a small panel, along with other gauges. The only thing inside the battery compartment under the stairs is the solenoid. You can hear a loud click when you click on the switch.