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Old 09-07-2016, 03:07 PM   #11
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Join Date: Jun 2016
Posts: 490
The problem is most likely your probes. A film develops on them and causes them to sense water where none exists. You can take them out and clean them but the problem could also be a bit of toilet paper over the end of the probe causing them to once again, sense water where none exists.

On an older camper I had I changed the probes out. System worked perfectly til the film migrated down onto the probe from the wall of the black tank and once again, it was always 1/3 full.

I think the definitive answer is to change the probes but use the Valterra probes. They come with a shield on the top to protect the probe from toilet paper and the film sliding down the tank.

Here is a link to an eBay auction showing the probes. Im not advocating that you buy these, SHOP AROUND for them but they have a good photo of the probes. It IS NOT my auction either.

Valterra T21301VP Tank Probe Black Water 4 Pack | eBay

I know I protest too much but I don't want someone to accuse me of trying to sell you something when it is not true.

Good Luck!

Maurice, LA

2012 Wildcat Sterling 32RL
2008 Chevy Silverado 2500HD LT Diesel
TST TPMS system w/ Flow-thru sensors
2001 Cougar 281 EFS (sold)
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Old 09-07-2016, 03:14 PM   #12
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Join Date: Jan 2015
Location: eastern NC
Posts: 791
sometimes a good blasting is the best way to clean off the contacts, the link below is of a gadget that is designed for doing just that,....... stick it into the tank, point in the direction of the sensors and blast away,...... it might help


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black, black water, tank, water, water tank

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