I would be checking the black tank by shutting off the water, and looking down the toilet.
Most of us have learned not to rely on the tank sensors, they tend to be unreliable. Perhaps you could get your sensors to work better by cleaning the tanks... Google 'The GEO Method'.
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Doug and Patience and Shelby the mutt
2015 Crossroads Sunset Trail Reserve ST26RB
2013 Ford F-150 3.5 EcoBoost XLT Supercab 4x4
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