Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 07-14-2015, 01:10 PM   #1
Junior Member
Join Date: May 2015
Posts: 3
Tank level sensors

My tank grey & black tank sensors are not reading correctly. Showing near full after I empty tanks. Any suggestions?

cqr is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-14-2015, 01:40 PM   #2
Moderator Emeritus
Gary RVRoamer's Avatar

Fleetwood Owners Club
Freightliner Owners Club
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 16,443
Ignore them.

Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
Gary RVRoamer is offline   Reply With Quote
Old 07-14-2015, 01:43 PM   #3
Junior Member
Winnebago Owners Club
Join Date: Mar 2014
Posts: 27
Originally Posted by Gary RVRoamer View Post
Ignore them.
Finding out that myself.
TinStarArabs is offline   Reply With Quote
Old 07-14-2015, 01:52 PM   #4
Senior Member
Commercial Member
Join Date: Nov 2014
Posts: 480
Try back flushing your black tank using a "Flush King" www.flushking.com The sludge in the tank on the sensors is causing the misreading. If you want other tips go to: www.allprowaterflow.com

Happy Camping
06 HR Navigator 45'PBQ Detroit 60 / 2011 Ford Edge
USAF 72-82 A1E/A1H(SkyRaider) DW Retired Nurse
niceguy9605 is offline   Reply With Quote
Old 07-14-2015, 01:59 PM   #5
bpotter's Avatar
Join Date: Apr 2011
Posts: 70
You didn't say which rig you have .....but if you have the Aladdin system there is a calibration you can do to see if that is the problem.

the URL below will download an '04 Aladdin tank interface module doc with the sensor calibration instructions.

'05 Monaco Dynasty Diamond IV 42'
'07 Chevy Colorado Crew Cab 4x4
bpotter is offline   Reply With Quote
Old 07-14-2015, 02:09 PM   #6
Senior Member
n5pht's Avatar
Winnebago Owners Club
Join Date: Aug 2012
Posts: 411
Blog Entries: 1
I agree with another post: Ignore them. I have had several RVs and none of them seem to do well. I currently have a Winnebago and they are supposed to be based on outside the tank - but still not reliable. Just look at the calendar or come up with a schedule if long term camping. Tank censors are just not there yet in my view.
Gary and Karen Stone - stick home in Texas
LCMS Church - 2014 Minnie Winnie 31KP, 2014 Jeep Gary is N5PHT, Ham Op, Retired from Fed Gov
n5pht is offline   Reply With Quote
Old 07-14-2015, 03:26 PM   #7
Senior Member
1ciderdog's Avatar

Join Date: Jun 2010
Posts: 4,238
The fresh water gauge works well on mine so when it gets down under a quarter tank I figure it is about time to drain the tanks. I don't connect to park water unless filling the tank. I've had four motorhomes and one 5th wheel and never did the black/gray gauges work on any of them.
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 1995 Wrangler
1ciderdog is offline   Reply With Quote
Old 07-14-2015, 04:08 PM   #8
Senior Member
Cat320's Avatar
Fleetwood Owners Club
American Coach Owners Club
Join Date: Mar 2011
Posts: 4,170
We are on RV number six. The first four had monitoring systems that did not work. Our last two have been American Coaches with oem Sensa Tank Leveling Monitoring Systems. This system has worked flawlessly on both our coaches.
2014 American Eagle 45T
DD 500
Pulling a Honda CRV
Cat320 is offline   Reply With Quote
Old 07-14-2015, 05:33 PM   #9
Junior Member
Join Date: Jul 2012
Posts: 4
I had the same problem on my Sanibel. I changed to Horst probes and it works great now. They were easy to change out.
sanibel is offline   Reply With Quote
Old 07-14-2015, 06:26 PM   #10
Senior Member
Rusty years's Avatar
Join Date: Dec 2012
Posts: 528
There's info on the forum to clean the sensors i.e. driving with full tanks to slosh around the sensors, putting cube ice in before driving. Mine are erratic but seem to settle down.
Follow us at: http://joelandesta.blogspot.com/
2006 HR Endeavor 40'...2002 Corvette
2011 Forest River 20' Cargo Trailer
Rusty years is offline   Reply With Quote
Old 07-14-2015, 06:36 PM   #11
Senior Member
Mr_D's Avatar
iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 22,397
We never had any trouble with our two Dutch Stars but they use external sensors. Having trouble with the Magna now (also external sensors) as the original owner didn't know or care to take care of it. When we first got it the black tank read 25% full when empty, now it takes a while to get there but I'm still getting old "stuff" out. Spent an hour last weekend doing nothing but flushing and draining the tank. Since I think we're not going to be able to go out for a while (DW's liver cancer treatments coming up) I'll get some Rid-X and let it work for a while.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey
Mr_D is online now   Reply With Quote
Old 07-15-2015, 07:34 PM   #12
Senior Member
dons2346's Avatar
Country Coach Owners Club
Join Date: Dec 2010
Posts: 3,667
This method works. It might take a few dumps but it does work. My 14 year old sensors work fine,
2002 Country Coach Intrigue
dons2346 is offline   Reply With Quote
Old 07-15-2015, 11:26 PM   #13
Senior Member
JFXG's Avatar
Newmar Owners Club
Freightliner Owners Club
Join Date: May 2012
Location: Today? Bellingham, Massachusetts
Posts: 3,127
cqr, does your system have any calibration capability?

John & Diane, Fulltime since '12
2002 DSDP 40, FL, Cat 3126
John & Diane, Fulltimers. RVM103 NHSO
On the road since June '12 with Lincoln, the guard cat.
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element
JFXG is offline   Reply With Quote
Old 07-16-2015, 02:07 PM   #14
Senior Member
Workhorse Chassis Owner
Join Date: Jun 2003
Location: Palisade CO
Posts: 3,395
It isn't the sensors, it is crudded up tank walls that fool the sensors. Any thing that cleans the tank walls might help.

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. The gray started reading 2/3 full all the time few months after I installed the system.

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.

Summer before last the rig sat unused next to the house all summer with the gray tank valve open and a hose that drained into a stone filled hole. When we got ready to head south and ran some water, a bunch of dried crud that had been on the side of the tank ran out. Since then (including all last winter) the gray water level has been accurate.

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. However their web site is no longer active so I don't know if they are still in business. "www.horstmiracleprobes.com"

Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.
Clay L is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Black tank sensors holdren National RV Owner's Forum 5 09-09-2015 07:25 PM
Black tank level Sensor is not working Ron & Kerrie Newmar Owner's Forum 12 07-06-2015 05:36 PM
Tank Level Indicators TK IV Palazzo Motorhomes 14 01-07-2015 01:57 PM
Holding Tank Sensors Pastordick Class A Motorhome Discussions 4 09-10-2014 03:48 AM
Grey Tank Sensors Ultrarex09 Monaco Owner's Forum 2 06-29-2014 07:38 PM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:15 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.