It will likely be close to the pump. If you don't know where the pump is, turn it on and listen for it. Mine was under the sink area with the pump, but I've since moved it outside.
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J & D in Lovely Weatherford, TX
2016 Jayco White Hawk 28DSBH TT
2014 Ram 2500 Crew Cab 4X4 6.7L Cummins