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Old 04-28-2014, 06:47 PM   #1
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Black water indicator light.

Just got home from my first trip. Everything went well and I was thrilled with all of it. Took three and a half weeks and put 2400 miles on the rig. The only issue I have is that even after I dump the tanks the black water indicator light is still lit showing a full tank. I know it is empty as I have watched it dump and checked it several times. My question is there any trick to resetting the light or any method of advice for a home fix? Or is it something I need to take to a repair service? Thanks in advance and I am sold on the entire experience and look forward to many, many future adventures.

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Old 04-28-2014, 07:27 PM   #2
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No trick, look up cleaning the sending unit or cover the light with tape or remove the bulb.

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Old 04-28-2014, 07:30 PM   #3
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It's a common problem and happens because the sensors are dirty. Most folks use the GEO method to clean (Calgon, Dawn and water...then drive...then dump). This has worked for us for several years. Sometimes back-flushing will work. Or, you can hire someone to come in send do a deep clean.
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Old 04-28-2014, 07:48 PM   #4
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I don't know what type control panel you have, some can be calibrated by taking the panel apart and adjusting a small set screw. You might try to google the brand or model number to find out how or do like I did and take it apart to see what makes it tick.

Good luck
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Old 04-28-2014, 08:14 PM   #5
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Thanks all. I will give these a try. I would much rather do it myself and will always try first.
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Old 04-28-2014, 08:30 PM   #6
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Unless you have a rinse plug option on your tank, this problem will always be there, you clean it one day and the next week you will have to start all over again, what I used to do before leaving on a trip, 1/2 fill the tank and toss 2 bags of ice cube, empty the tank when you get to the camping, and never forget to put at least 5 gallons of water before using it,
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Old 04-30-2014, 05:52 PM   #7
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To clean my black sensor I have been using the GEO Method. I also have a built in sprayer to flush the tank. One old method that I have tried is to dump, fill black tank with water and dump some ice cubes down the toilet. I then drive to the next campground and dump. This cleans the sensors.
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Old 05-02-2014, 09:22 AM   #8
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There are also other types of sensors you can install which measure the level thru the tank walls, vs a screw sticking on the inside. They are installed on high end rigs and work very well. Nothing to clean with them and work with crud on the walls. Not cheap tho.
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Old 05-02-2014, 09:33 AM   #9
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The GEO method is good. The real solution is water, water,water.
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Old 05-02-2014, 03:31 PM   #10
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Internal tank sensors are so unreliable (without constant effort to keep them clean) that they are pretty much useless. You don't really need one for the black tank because it's pretty easy to tell when the tank is getting full just from the sound when you flush, but if you do want a functional gauge that you don't have to constantly maintain then one of the external sensor systems is the only answer.
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Old 05-03-2014, 06:38 PM   #11
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Figure out how many days you can go on the black tank then dump it. Even if you manage to clean them, the next time a piece of TP gets hung up on the sensor, they are off again.

My suggestion is to just stop obsessing about them. They don't work. The other sensors do.

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cat, water

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