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Old 03-09-2022, 02:08 PM   #1
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Grey and black water indicators wrong

Our grey and black water indicators are incorrect. When we flush the tanks they stay the same. Are there sensors that need cleaned or something? Any assistance is apprrciated. Thanks in advance.
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Old 03-09-2022, 02:38 PM   #2
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The OE sensors are inherently inaccurate due to their design. The inside head of the sensor is close to the tank wall, and anything can easily stick to them and complete the circuit to the ground sensor. Our black tank sensors still work ok. primarily because I flush it out with a wand down the toilet every outing. The gray sensors aren't easily cleaned, and were replaced with Horst Miracle Sensors after eight years, and starting to read 1/3 all the time. You may get some satisfaction from a tank cleaning chemical.
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Old 03-09-2022, 06:02 PM   #3
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As @JFlightRisk states, they are not accurate after minimal use from the factory.

With the black, learn to listen to the water being dumped into the black tank; when level is low a hollow deep sound, when getting full a more backing up gurgling sound.

The grey sensor tends to work better at/near the upper full level, less accurate with lower level.
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Old 05-20-2024, 07:18 AM   #4
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I have grey and black tank reading issues too.

Both my grey and black show Empty when I press the buttons. It's a KIB panel. The battery button shows all the lights. I don't use the fresh water tank.

Is this more than a sensor issue if both tanks show empty?

Thank you,
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Old 05-20-2024, 09:39 AM   #5
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We bought a used Alante. The sensors showed 1/3 full on both tanks after draining. My solution was to use 1/2-3/4 cup of Borax dissolved in hot water, with a clothes washing POD put in the black tank prior to driving with about 10 to 20 gallons of water. Leave it in until you have to drain and clean the tank. Dose it every tank. It may take a few times. Gray, Borax, with de-greaser.
Mine work fine again.
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Old 05-20-2024, 10:46 AM   #6
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Quote:
Originally Posted by Stover999 View Post
Our grey and black water indicators are incorrect. When we flush the tanks they stay the same. Are there sensors that need cleaned or something? Any assistance is apprrciated. Thanks in advance.
This is an often covered topic. They likely will never be accurate and worrying about it is wasted time and effort.

Leave the gray tank open when at your site. Leave the black closed and when the toilet “burps” it is time to dump and flush. Other wise forget them.

There are cleaning methods and most of those are either covered in the search feature above with previous threads or a search of the Internet will give you several cleaning methods. Those will work for a short period of time and they will again be inaccurate.
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Old 05-20-2024, 01:49 PM   #7
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This is an often covered topic. They likely will never be accurate and worrying about it is wasted time and effort.

Leave the gray tank open when at your site. Leave the black closed and when the toilet “burps” it is time to dump and flush. Other wise forget them.

There are cleaning methods and most of those are either covered in the search feature above with previous threads or a search of the Internet will give you several cleaning methods. Those will work for a short period of time and they will again be inaccurate.
This is the way.

With time and experience, you'll begin to understand your capacities and you'll know how long you can go before your tanks get full. We never worry about the gray tank, and we can go a long time before full black if we're careful.

"Pro-tips": Take Navy showers to limit gray water, and use "outside" restroom facilities (like at a park/restaurant/rest area/fuel stop) whenever possible to limit black water.
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Old 05-20-2024, 02:50 PM   #8
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We bought our RV to use.
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Old 05-22-2024, 01:08 PM   #9
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We bought our RV to use.
Agreed.

My advice was more general in nature, and for times when you have acceptable "alternate" accommodations, and won't have the ability to empty tanks before they're too full to use.

Personally, we can go quite a few days before full tanks as we've learned how to do it. And that's pretty much using our own facilities 100% of the time. We don't have a whole lot of boondocking opportunities that last more than 2 nights; primarily because of schedules. So I don't typically worry about waste tank capacities anyway. But like I said, we know how to make them last if we need to.

And I've never trusted any of our tank sensors, even when brand new.
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