OP, if this rig is new to you, use a clear connection and check that the black tank is marked correctly. My black and grey were reversed and I have heard this many times. Also we use Calgon and Dawn and the sensors are still working after three years.
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Jim B
2017 Lariat F-350 FX4, CC, SB, 6.7 PSD 4WD
2018 MONTY 3731FL, at our private winter site in GA
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