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Old 07-31-2015, 09:18 PM   #1
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level test light

Black tank light staying on 2/3rds full even empty, any info why?
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Old 07-31-2015, 09:43 PM   #2
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The tank level sensors are simply screws thru the side of the tank at different levels. They are connected to sensitive electronics that sense a low resistance connection between the level sensor and ground. If paper or other crud stick to a sensor and touch the ground it will register as full to the level of the gunked up sensor. There are many ways to clean the sensors , but there is no sure way. Try adding 1-2 gallons of hot water and 1/2 cup of dishwasher liquid before your next trip. When you get to your destination empty the tank.
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Old 08-01-2015, 09:59 AM   #3
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Makes sense, will do thanks
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Old 08-01-2015, 11:14 AM   #4
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No dishsoap

I would not put dish soap. It will make lots of foam. Add a cup of bath softer and a cup of laundry soap to tank.
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Old 08-01-2015, 11:17 AM   #5
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What difference does the soap foam make a few gallons of water 1/2 cup soap in 30 -40 gallon tank just wondering


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Old 08-01-2015, 11:20 AM   #6
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I just was always to to use Landry soap. Very little foam.
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Old 08-01-2015, 11:27 AM   #7
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I have tried everything over the years with different rv's nothing ever worked for me but changing sensor


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Old 08-01-2015, 09:18 PM   #8
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I do not rely on and sensors as they are junk and always read wrong. Using the unit will give you a solid feel for tank limits . Worst case, tub will not empty and toilet contents will not go away. Just pull handles and all is well.. My $0.02 worth.


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Old 08-02-2015, 02:37 PM   #9
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I have had some luck with putting ice cubes down the toilet 2 gal water and a quarter cup of laundry detergent drive home dump and flush at my local 76 station at least the black tank reads empty. Also any opinions on storing the MH with the valves open or closed? Liquid in the tank or dry?
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Old 08-02-2015, 05:52 PM   #10
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Quote:
Originally Posted by Garrette View Post
I do not rely on and sensors as they are junk and always read wrong. Using the unit will give you a solid feel for tank limits . Worst case, tub will not empty and toilet contents will not go away. Just pull handles and all is well.. My $0.02 worth.


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If you use the spray wands thru the WC and know where exactly where the sensors are you can easily water blast the wall of the tank. Wet TP does not hang from anything for long, the wastes liquid etc form a conductive film on the walls and that's what causes your probes to conduct. Ice and water also work but may be a bit more risky for probe damage. Concentrate the spray to the sensors and system will in 10 minutes or less.
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