Chevy 02 is probably right, the 3rd switch in my 831FKBSS is for my outside step light, hard to see by day but try around dusk to see if the switch controls that light.
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2016 Dodge Ram Dually 4X4 Quad cab LB 3500 Cummins 6.7L TD / 2013 Columbus 320rs. Camped 92 days in 2017, 94 days in 2018, 108 days in 2019 and 112 days in 2020.
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