Our ice maker line was tough to see. The valve was facing the back wall. Should be two pex hoses under the sink, one red, one blue. The blue has a splitter with a clear line going down and out to the ice maker. Another larger clear line to the dish washer if equipped from the red pex line. Both have shut off valves on them. Let me know if you need more info, at my rig today.
Skip & Patty
2013 Redwood 36RL
2015 Ram 3500 Laramie CC DRW 4x4 (Bertha)