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05-06-2017, 10:00 AM
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#1
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Junior Member
Join Date: Apr 2017
Location: Austin
Posts: 14
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Help!! Grey tank shows full
So on our first run with our TT the forest river signature series 8328BS. Well we hooked up to a full rv site. Got everything running draining properly.... after first and only shower system read "grey tank" 2 full!!! Confused as all get out when out to drain and made sure valves were open and nothing came out?? Anyone have this problem before???
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05-06-2017, 10:11 AM
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#2
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Senior Member
Join Date: Feb 2013
Location: Pfafftown NC
Posts: 2,353
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Don't know your model and cant look it up right now but any chance you have 2 gray tanks?
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There are 10 types of people in the world.
Those that know binary, and those that don't.
2013:31 / 2014:51 / 2015:58 / 2016:37 / 2017:46
2018:16
Total 239
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05-06-2017, 10:12 AM
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#3
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Senior Member
Join Date: Sep 2010
Location: Eastern Ontario
Posts: 4,167
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Since you have a 108 gallons total grey tank, you must have two grey tanks, so have you open two grey tank valves? You would have a total of 3 valves on your trailer (1 black, 2 greys)
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Fonzie
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05-06-2017, 10:15 AM
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#4
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Senior Member
Join Date: Oct 2014
Location: Wilmington, De
Posts: 239
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On my 5th wheel, 2nd valve is on frame behind rear tire, drivers side
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05-06-2017, 10:30 AM
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#5
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Senior Member
Join Date: Jan 2016
Location: x
Posts: 12,423
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there may be several reasons for that reading. Like others have said check and ensure if you have a second tank that the valve for it is open. (black should be left closed until tank full just saying). If all valves are correct it may be as simple as some hair and soap scum on sensor try filling the tank and flushing it and see what happens. Let the forum know what you find even if it embarrassing we have all been there.
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Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
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05-06-2017, 10:47 AM
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#6
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Junior Member
Join Date: Apr 2017
Location: Austin
Posts: 14
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Correct i have 2 grey tanks. Both valves are open.... the black valve is closed. Granted we only do number 1 in the toilet. BUT this our first outing with it and one shower would not put 108 gallons ����. Ya im just confused makes no sense.....
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life is good! 
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05-06-2017, 11:03 AM
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#7
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,149
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Well you'll learn you can't trust the sensors. Are you sure it's full? I realize you said you opened the valve and nothing came out but usually a full grey tank will back up in the shower.
Also maybe the valves are marked or connected incorrectly.
Since you are at a full hook up site, check to be sure the black tank valve isn't by chance one of the greys. Open them all and run water or flush toilet and see which one the water comes out.
A few drops of food coloring in the drain helps determine which is which.
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05-06-2017, 12:02 PM
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#8
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Senior Member
Join Date: Apr 2016
Location: Cedar Creek Lake, TX
Posts: 3,484
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On my trailer they reversed the sensor wires from the tanks with black labeled as grey, etc.
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Cedar Creek Lake, Texas
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05-06-2017, 12:24 PM
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#9
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Senior Member
Join Date: Apr 2012
Posts: 1,472
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Regardless of what sensor reads, OP says nothing comes out after taking a shower. Maybe 5Picker is correct with the mislabled valves. On my trailer the black valve has a much larger pipe leading to it than the grey if that would help identify the two.
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You can avoid reality, but you cannot avoid the consequences of avoiding reality – Ayn Rand
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05-06-2017, 12:26 PM
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#10
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Carknocker Family
Join Date: Mar 2013
Location: Arkansas
Posts: 690
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Are your valves cable operated or hands on? If cable, it may have broke /came off, or not installed correctly. First use, right?
If hands on operated, is the handle still moving blade inside valve?
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05-06-2017, 12:49 PM
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#11
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Member
Join Date: Mar 2016
Posts: 66
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Drain Valves
Try here for you drain valves:
Look under the front slide about center. It is hard to reach when the slide it out. Should be marked on the body. The "T" handle pulls toward the side not straight out.
A grey and a Black should be behind the rear tires.
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05-06-2017, 01:50 PM
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#12
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Senior Member
Join Date: Jul 2015
Posts: 426
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Never , ever trust the gauges . Also save some grey water to flush the black water flush hose !
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05-06-2017, 02:29 PM
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#13
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Senior Member
Join Date: Mar 2013
Posts: 710
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As others have stated, don't ever trust the sensors. I always trust my wife's visual and audio sensors which go like this; "Honey! The water's not draining in the sink." And I reply; "I'll go right out and drain the tank." Works every time!
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05-06-2017, 03:29 PM
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#14
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Senior Member
Join Date: Nov 2016
Location: Arkansas
Posts: 490
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May have been some water left in from when it was checked.
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05-06-2017, 11:00 PM
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#15
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Junior Member
Join Date: Apr 2017
Location: Austin
Posts: 14
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Quote:
Originally Posted by Ida Ratherbe Camping
Are your valves cable operated or hands on? If cable, it may have broke /came off, or not installed correctly. First use, right?
If hands on operated, is the handle still moving blade inside valve?
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Mine are manually operated. Yes the valve is opening. Sadly stuffed my hand in there to verify.. with gloves of course. I came back from a wheelin trip and the tank registered empty?? Ya im so lost... lol
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05-08-2017, 08:20 AM
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#16
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Senior Member
Join Date: Jun 2016
Posts: 184
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Quote:
Originally Posted by Lloydg
As others have stated, don't ever trust the sensors. I always trust my wife's visual and audio sensors which go like this; "Honey! The water's not draining in the sink." And I reply; "I'll go right out and drain the tank." Works every time!
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I third this!
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05-08-2017, 02:31 PM
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#17
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Senior Member
Join Date: Jul 2016
Posts: 133
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Quote:
Originally Posted by RV_Fan44
I third this!
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I 4th this! Lol!
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05-17-2017, 12:59 PM
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#18
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Senior Member
Join Date: Dec 2016
Location: Clear Spring MD
Posts: 131
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Quote:
Originally Posted by Lloydg
As others have stated, don't ever trust the sensors. I always trust my wife's visual and audio sensors which go like this; "Honey! The water's not draining in the sink." And I reply; "I'll go right out and drain the tank." Works every time!
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LOVED THIS... Yes the DW is Always right.... 
Thanks for the chuckle...
This is DW/Debbie
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Been an RV owner since 2003
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