Water shut-off switch for refrigerator

Depends what you're trying so accomplish.
Turning off the ice maker is just lifting the feeler wire. On ours, and I suspect most others there is no valve except for the water filter feeding it and the sink drink dispenser

Mine has a regular water shutoff valve you turn.

Mine has a regular water shutoff valve you turn.

There is no switch. It's a manual valve. Our 2009 HR (Monaco) has the valve under the kitchen sink area.

In the same bay as your 12V water pump you should have a water manifold with red/hot and blue/cold valves. The ice maker will be paired with something else...maybe the cold for a sink and it should be labeled. There should be a tool on the manifold to turn the valves on/off. There may be another valve under the sink to turn just the ice maker off.

Mine is also a manual valve. I would suspect the location depends a lot on the model of your RV. My frig is in the slide and, the water shutoff is located inside the lower outside access panel.

My coach is a 2004 Coachmen Sportscoach and the valve for the ice maker is in the outside access panel.