Those wires - four of them - are for the level sensors in the gray water tank. The first two photos show the studs that they should be attached to. The four of them run up to the sensor panel on the kitchen sink front apron. You need to dig up the manual for the sensor panel, and see where the wires are supposed to be connected. The mfr web site has all the info. I wouldn't advise making random connections.
Bill
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