Henry,
Thanks for the added information. These switches are most commonly referred to as "battery
disconnect switches". I don't have a schematic for your coach in this area, but do know that the disconnect switches in the stairwell each operate a separate latching high current relay in the rear power bay near the battery banks. Each switch should have a wires going back to the relay -- the number of wires depends upon the type of relay in the power bay (latching relays are made by Intelletec and by KiB) Typical wiring is shown below:
How many wires are on the step well switch?
Chuck