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Old 07-10-2011, 06:59 PM   #31
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Join Date: Jun 2011
Location: Massillon. Ohio
Posts: 173
So much for the great horst black water probes. Installed probes and every thing read 0. After one week of camping I dumped black water tank. After rinsing twice I checked monitor again only to discover it read 1/3. I rinsed again and checked monitor and still 1/3. I just wasted time and money replacing old probes with Horst probes.

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Old 07-10-2011, 07:18 PM   #32
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Join Date: Oct 2009
Location: South Eastern PA
Posts: 19,826

I am really sorry your experience with them was not as good as mine (so far).

Some things to check (assuming you want to drop your belly pan again) is the lowest probe being oriented correctly. I almost rotated mine out of alignment when I tightened up the wire nut. I wear bifocals and of course the focal length at arm's length sucks. I can read and drive fine, but shooting a rifle or working over my head with tools is a challenge. Trying to fine focus at that distance is darn near impossible.

The only way for that probe to be "on" is for there to be an electrical connection between the probe wire and the ground probe. If you are not getting a complete dump for any reason the "1/3" probe will be under water. Since the ground and the "on" probe are at the same level in the tank, it won't take much to turn it on legitimately. The dump valve is not at the very bottom either. Some water will always be in the tank unless you let it dry out with the valve open.

In my camper, one #1 flush will turn on that light.
It is really a "Not Empty" light.

As you can see from the picture of the tank, it will not take much sludge in the bottom of the tank to keep that light on. Maybe an RV-Digest-it treatment for 24-48 hours might be in order.
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black tank

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