Help identifying a switch and gaining access( Now With Pic )

Never did figure it out It's not a heater or a pump not too worried about now

I had a switch in a previous camper that I had the same issue with, had no idea what it was for and wiring was inaccessible. After awhile I just forgot about it.
On a camping trip one time,my grandson saw the switch and went over and turned it on, what kids do, turn on switches, a build in floor nightlight came on. Never saw that darn light before because I was not looking for it and it was never semi dark in the camper. Not saying that it is what your switch is for but might be worth looking into. Grandkids, just got to LOVE them. Smarter than the average adult. Good Luck in your search.

Water pump - most likely. If you hook up to an external water source, it's no big deal, but if you are booddocking, the pump is how you get water pressure out of the tank. With the trailer power on (battery), do you hear a pump turn on in the water tank when you flip the switch? On our trailer, the water tank is under the bench seat. Is this bench seat in your trailer immediately adjacent to where the water inlet is on the outside of the trailer? We have one other switch in that location which turns on the igniter for the hot water heater.

Thanks for all replys will check it out and pass it on

I have seen furnace switches in bathroom on a cabinet.
Water pump switch on tank level panel.
Odd ball switches for lights
Other odd ball for aftermarket pump or 12vt wired/plug in appliance

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My guess is holding tank heaters.
Go under the trailer and see if there are heaters attached to the tanks.

That's what our water heater switch looks like (but it has a red light next to it to show that it lit).

I have a switch like that, mine goes to the fresh water tank heater.
Look under the trailer at the fresh water tank mine has a black rectangular heater glued to the bottom of the tank.

Well, now, that's no fun!