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Posted 01 August 2012 - 06:46 PM
2008 Forrest River Charleston
Posted 01 August 2012 - 07:17 PM
Posted 01 August 2012 - 07:38 PM
Dianne and Brett Wolfe
1997 Safari Sahara 3540
Moderator, FMCA.com Forums
Chairman, FMCA Technical Advisory Committee
Member, FMCA Long-Range and Development Committee 2007-2009
Moderator, http://www.dieselrvclub.org/(FMCA chapter)
Posted 01 August 2012 - 08:26 PM
Posted 02 October 2012 - 10:10 AM
Posted 02 October 2012 - 02:29 PM
Ross & Melanie Boyer
2006 Fleetwood Expedition 37U
Cat C-7 300HP
Posted 02 October 2012 - 02:59 PM
Actually I ended up with a different brand that was in stock at Camping World. It works great, solving the problem forever. One unexpected difficulty was that the new unit needed 3 wires from the tank whereas original had only two each tank, so I did have to run a new cable to each of the three tanks.
Posted 02 October 2012 - 06:53 PM
Posted 03 October 2012 - 11:26 AM
If it's made by Ventline as many are, there is a 68k ohm resistor between the full and 2/3 sensor and one from the 2/3 sensor to the 1/3 sensor. The wire from the panel connects to the full sensor. On some units the resistors are potted in a small plastic cup close by the tank with one wire leading from it back to the panel. There is another wire from the ground sensor also going back to the panel. There are also wires from the cup to the sensors.
On others all four wires go into the wiring harness and I don't know where the resistors are located. Maybe on the display panel?
The display panel has five "LM339 Low Power Low Offset Voltage Quad Comparator" ICs (one for each waste tank, one for the propane tank, the water tank and one for the battery voltage) that are used to sense the voltage drops across the sensors and activate the proper LED.
The non-contact sensors are better but not foolproof either. According to their web site the SeeLevel system can also be fooled but at least it just stops giving a reading rather than showing a false one. That is your signal to clean the tank walls.
I have the TrueLevel non-contact system that Winnebago went standard with in 2005 (right after I bought mine of course so I had to add it) and right now my black tank reads full all the time but the top two LEDS of my gray level are accurate.
I have pressure washed the black tank wall twice and it worked okay for a while then started reading full all the time.
In my years of trying all of the things people recommend I have not found anything that keeps the tank walls clean enough.
Some people have reported that the HORST MIRACLE PROBES work well. They shield and move the sensors out from the tank walls so the gunk doesn't fool them.
Clay (WA5NMR), Lee (Wife), katie & Kelli (cats)
Full timer domiciled in SD for 11 years. Now snow birds with a house in western CO
2004 Winnebago Sightseer 35N - Workhorse chassis
Posted 12 December 2012 - 02:06 PM
I think when I installed my See Level system it required 2 wires and I had 4 or 5 wires with the original system, been quite a few years ago since I did it. Has worked well all these years.
Ditto. seelevel rocks. and (if you put a second monitor in the water bay) only needs 1 wire going topside.
Posted 17 April 2013 - 11:18 PM
Now to realize why tank sensors proceed awful it’s worth comprehending a little about how they work. Most RV tank sensors are fundamentally just 4 attach searches that attach into the container. When fluid hits the attach it makes contact & completes a circuit that turns the LED lightweight on your section on.
Posted 30 January 2014 - 07:44 AM
I have the type of system Clayl mentions in my 08 Itasca too! And as he said it still acts up. I have used one of those pressure lines thru the stool on the black tank and helped for a while.
But has anyone found a product can put in to help keep the tank walls clean so it can read the level.Thought that was supposed to be the cure all for that old problem they always blamed crude on the sensors in the tank but now no internal ones and still acts up!
Anyone find a product to keep the wall so clean it that is why the problem, but how does that explain the fact my fresh water one doesn't work any better either? At least the fresh tank is kind of opaque can see the level there-- wish the others were that way!
Best most reliable system I have seen was on my converted bus just drilled a hole in top of tank and marked a dowel with levels then just dipsticked it always reliable!!
Also tagged with one or more of these keywords: water, gray, black
Water and holding tanks →
Water and holding tanks →
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