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Old 05-24-2013, 09:59 AM   #1
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377 XL black water indicator

Emptied black water and indicator inside still shows three quarter full. Any ideas?
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Old 05-24-2013, 10:01 AM   #2
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Your sensors and tank wall are dirty/slimy.

You can try a sensor cleaner, but I had better luck just replacing the sensors with Horst Probes.

Horst Miracle Probes for Wastewater Tanks in Recreational Vehicles RVs

Horst Miracle Probes Demonstration by Jim Grich of AmericanRVer - YouTube

Horst tank Probe Installation
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Old 05-24-2013, 10:16 AM   #3
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This rig is brand new so I may have to take it back to service. Guess as long as I know the level, it should not be a big issue.
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Old 05-24-2013, 10:29 AM   #4
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Those factory installed probes are worthless.

If I could get to my tanks, I would do the Horst Probe mod but these GT MH's have the tanks up inside the chassis and are sprayed with a foam insulation underneath.

So, I generally flush the black tank well at each emptying and when the probes show it full, I watch the level manually or, if convenient, dump.

The gray tank is harder to watch manually but as long as there is nothing entering the shower, I am OK.

Bill
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Old 05-24-2013, 10:49 AM   #5
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Quote:
Originally Posted by SaladoBob View Post
Emptied black water and indicator inside still shows three quarter full. Any ideas?
For now all I would do is fill and flush and drain the tank a couple of time.
I have also use plenty of water when I flush and only use septic tank safe toilet paper (usually only 2 ply) . No napkins, tissues or paper towels at all.
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Old 05-24-2013, 10:58 AM   #6
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Sometimes due to rsidual moisture in the tank the indices may illuminate for awhile till dried. Mine does the same thing for a time period sometimes after cleanout.
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Old 05-24-2013, 11:08 AM   #7
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Quote:
Originally Posted by SaladoBob View Post
This rig is brand new so I may have to take it back to service. Guess as long as I know the level, it should not be a big issue.
You will be paying. This is not a warranty item.
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Old 05-24-2013, 11:09 AM   #8
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Originally Posted by bend302 View Post
Those factory installed probes are worthless.

If I could get to my tanks, I would do the Horst Probe mod but these GT MH's have the tanks up inside the chassis and are sprayed with a foam insulation underneath.

So, I generally flush the black tank well at each emptying and when the probes show it full, I watch the level manually or, if convenient, dump.

The gray tank is harder to watch manually but as long as there is nothing entering the shower, I am OK.

Bill
Bummer.
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Old 05-24-2013, 11:10 AM   #9
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I would try a 72 hour treatment of Rid-X or Unique's RV-Digest-It.
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Old 05-24-2013, 06:16 PM   #10
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Of course, I get back tonight and the indicator seems to be working fine. That is how it goes sometimes.
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