Unlabeled Wet Bay Rocker Switch on 2026 Montana 3900RK

[Dave And Char]

Hi,
We are New here but I have a quick question on a New 2026 Montana 3900RK. Does anyone know what the unlabeled black rocker switch above the black water flush valves in the wet bay does ? Attached is a picture of the switch… It doesn’t seam to turn on a light or make any audible noise when you push it up or down but we have electric gate valves and I want to be sure I don’t need to have it in a particular position before I back flush my tanks..
Any help with this would be appreciated..

 

[RoboM]

Hi,
We are New here but I have a quick question on a New 2026 Montana 3900RK. Does anyone know what the unlabeled black rocker switch above the black water flush valves in the wet bay does ? Attached is a picture of the switch… It doesn’t seam to turn on a light or make any audible noise when you push it up or down but we have electric gate valves and I want to be sure I don’t need to have it in a particular position before I back flush my tanks..
Any help with this would be appreciated..

Have you tried it in the dark? My 2026 3100RL has a similar switch for work lights near the jacks.

 

[Ramman]

my wife googled it and came up with this: in the wet bay of a Keystone Montana 3900rk, any rocker switches are generally used to control the 12V DC tank heating pads, the water pump, or wet bay flood light.

 

[Rene T]

To be sure, why not contact the dealer

 

[Dave And Char]

Thank You..
I did finally talk to my dealer..
It turned out to be a switch that controls two very small yellow lights under the body by each termination valve to help you see at night while dumping. It has to be pitch dark to see them…