The sensors in the tanks are notorious for incorrect readings. I also have a black tank flush and no matter how long/often I use it my black water tank shows 1/2 or 3/4 full. So what I do is look down the toilet as I flush and if I can see the waste water level I then dump the black tank.
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Joe, Joyce , 4 Kids and 5 Crazy Dogs.
2017 Chevy 3500 HD Silverado LT Dually 4x4 .
2010 Jayco Jay Flight G-2 32 BHDS[IMG]https://www.jaycoowners.com/forums/imagesng
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