I would suggest opening the side of the panel (where the filter is) and see if the linkages are connected, and where they go. There are stories out there of mislabeling, where the black label was on the grey tank, and viceversa. If there is no waste in the black, or if you are connected to a sewer dump station, you could pull the other handle and see if they are just labeled backwards....
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Be Safe, and Everyone Goes Home,
Rick
2014 RAM Laramie 2500 w/6.7L Cummins Diesel and Automated Safety Hitch
2016 377RLBH Jayco North Point
300W of Suntech Solar w/Rogue MPPT Controller & Xantrex 2000W PSW Inverter
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