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Old 07-18-2023, 09:10 AM   #1
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Join Date: Jul 2023
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Black water sensor

Hi, this is Charlie, I have 15 foot Jayco swift trailer. It's awesome, it does what we needed to do for just the 2 of us. But every time my husband goes to empty the black tank. It still reads 3/4th full, sometimes half full. Sometimes a 1/4 full. don't understand when it's totally empty or hooked up to the sewer.
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Old 07-18-2023, 09:21 AM   #2
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Those sensors are just unreliable. Ours do that too. They can get "stuff" on them which completes the circuit and causes them to light up. (they work when water or something completes a circuit). Often when ours have been showing erroneous readings they start working again after being cleaned off by the black tank flush.
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Old 07-18-2023, 09:27 AM   #3
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Location: Richmond VA
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Sensors are typically just bolts thru the wall of the tank and those in the black tank are infamous for acquiring sludge (polite term) on them as well as the tank wall.

There are exotic solutions but Horst Miracle Probes (<--- that's a link) are an inexpensive solution that have worked well for me for years. Drain the tanks, unscrew the wires (paying attention to which goes where), and knock the old bolts into the dank where they'll come out when you drain it again. Install the new probes following the instructions on orientation.

Odorlos and an enzyme will minimize sludge build up.

-- Chuck
2006 Roo 23SS behind a 2017 Ford Expedition
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Old 07-18-2023, 09:37 AM   #4
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Do a search on black tank emptying/cleaning. Many methods of keeping sensors cleaner. Just have to figure out what works for you.
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black, black water, water

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