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Old 07-27-2011, 09:25 AM   #1
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New Horizons Owners Club
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Posts: 13
Grey Tank Sensor Reading Incorrect (1/4 full)

I have had a low grey tank sensor reading (1/4 full) regardless if the tank was full or not. I tried recalibrating without success. I've also put a very large amount of tank cleaning/odor reducing liquid into the tank when it was full and left it in for 5 days also without success. Any suggestions?
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Old 07-27-2011, 09:37 AM   #2
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Posts: 13
Smile Sensor Fixed!

While searching on the Internet, I found the name of a man named Dennis Ferriello who previously worked for Snake River which is the company that made my tank sensing panel and sensors. I called him for help and he was very gracious and helpful. He suggested that I do some diagnostic work with a volt meter. After a while, I found out it was just corroded wire connections causing the problem. But I attribute the repair to Dennis. He does have his own company that produces tank sensors and displays, but he didn't push his products on me at all. He even offered to send me some old Snake River parts at a significant discount. If you need any help with tank sensors, I would highly suggest you call him. Snake River is now owned by a company called Tech-Edge, but when I called I was put into voice mail and they didn't return my call until the next day. You can find Dennis by calling 435-656-0042 or sending him an email at His website is
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Old 12-29-2011, 09:48 PM   #3
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I finally gave up on the RV industry idiot lights, and replaced them with the SeaLevel II sensors over the same wiring. This gives me about 4-5% levels, and will read zero when the tanks are empty. Problem solved.
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Old 12-30-2011, 10:28 AM   #4
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I see a lot of "Sensor broke" type messages.. The sensors are no mor complex than a nail or screw.. That is a metal rod that sticks into the tank, the assumption is if it's wet, then the liquid level in the tank is at least as high as the sensor.

Scum builds up on the wall next to the sensor and .... keeps it wet, no fix

There are some better nails, called Horst Probes, may work better and I do plan on testing them....later.

See Level sensors are a whole different horse though, they work 100% differently and thus,, actually work. I see JRMilner has already told you about 'em.
Home is where I park it!
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Old 12-30-2011, 04:31 PM   #5
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The first thing you must determine is that the sensor itself is still firmly in contact with the tank. Mine fell off of the black tank and I had a similar problem. I crawled under the rig and stuck it back on with much effort and several tries.
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Old 12-30-2011, 04:57 PM   #6
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I don't see a problem with 1/4 showing. As long it shows FULL when full you have no problem.
My Grey tank has showed 3/4 FULL for 9 years now. But FULL will lite up when tank is full. Or it will back up into the shower when full.

Black tank has always showed full for 9 years. But if I dump every 11 days there is no problem. Besides when it gets that full, you get a small smell reminder it is getting close to full when you use it.
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Old 12-30-2011, 05:05 PM   #7
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Just a note to keep sensors clean and functional...
When we are empty and traveling for the day or going home I always dump the ice from the cooler or a bag of ice and about a third to a half of a bottle of "pine" cleaner from the dollar store in the commode on top of about 5 gallons of water. This acts as an abrasive cleaner on the walls n contacts as we are driving.
No problems with sensors and smells pretty good too!
My 2 cents...
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Old 12-30-2011, 05:28 PM   #8
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tpelzek, thanks so much for the links to, I have bookmarked it so when we need tank sensors we will know where to go.
Happy trails,
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Old 11-05-2020, 12:46 PM   #9
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Hello, i just read your post about your sensor falling omg your black tank. Not sure how long ago it was. However, I’m having the same trouble with my grey tank. I stuck it back on, guessing the location it cam off. It now reads full all the time. What could be wrong?
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