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Old 10-19-2021, 06:24 PM   #1
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Water Tank Sensor wiring and who has pulled a tank?

Ok recently over filled the tank and water level is still reading full

I see the water level sensors rely on 4 sets of negative and positive posts that start low in tank and increment up...lowest being low and of course highest would be full

With the sensor readout reading full I would suspect that some where the wires are shorted out at the top of the tank some where? possibly at a connection somewhere.

Where to the wires lead coming from sensors

For those of you that have pulled your water tank could you give some advise?

Much appreciated,
Greg
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Old 10-20-2021, 01:38 PM   #2
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My tanks read whacky and act funny too...

Ch
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Old 10-20-2021, 01:56 PM   #3
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I'm hoping this sensor system hasn't changed over the years ; so here's how it worked when I started in RV repair .

I do know that few RVs use the through wall sensor system anymore .

In the harness that leads to the tank mounted sensors , there are resistors , that feed power back to the board when the in tank water level allows power to pass between the contacts in the tank wall.
The display board sees the different resistance and the display lights up accordingly .
I'll see if I can dig up any testing info for the sensor circuit .
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Old 10-20-2021, 02:44 PM   #4
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Quote:
Originally Posted by Skip426 View Post
I'm hoping this sensor system hasn't changed over the years ; so here's how it worked when I started in RV repair .

I do know that few RVs use the through wall sensor system anymore .

In the harness that leads to the tank mounted sensors , there are resistors , that feed power back to the board when the in tank water level allows power to pass between the contacts in the tank wall.
The display board sees the different resistance and the display lights up accordingly .
I'll see if I can dig up any testing info for the sensor circuit .
Thanks Skip
And that's exactly how I figured it worked
We are in Mesa now and will be here for a bit so going to drained the water tank completely as we will be on city water
Schematics show wires 240 to 243 are sensor wires that lead to m8. What ever that is?I imagine goes to control board

Going to be in mesa for a bit and coach will remain until I come.back in late november for the winter

Greg
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Old 10-20-2021, 03:16 PM   #5
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You could also consider upgrading to the Seelevel tank monitoring system. This system uses external sensors and measures from 0-100%.

You can see their products at

https://www.garnetinstruments.com/rv-shop/
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Old 10-20-2021, 05:42 PM   #6
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You could also consider upgrading to the Seelevel tank monitoring system. This system uses external sensors and measures from 0-100%.

You can see their products at

https://www.garnetinstruments.com/rv-shop/
This is what we will be doing over the winter. In addition to reprogramming the Silverleaf to work with our replaced inverter and adding the Silverleaf TPMS...

Still very curious about the tank removal though...

Ch
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Old 10-21-2021, 10:01 AM   #7
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Thanks Skip

Schematics show wires 240 to 243 are sensor wires that lead to m8. What ever that is?I imagine goes to control board


Greg
FWIW

On my old rig, those wires go to the Tank Monitor Circuit Board which is in the curb side overhead dash.
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Old 10-21-2021, 10:50 AM   #8
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Originally Posted by gnvrvin View Post
With the sensor readout reading full I would suspect that some where the wires are shorted out at the top of the tank some where? possibly at a connection somewhere.

Where to the wires lead coming from sensors



Much appreciated,
Greg
I have not physically inspected the tank or the levels sensors. But, I have diagramed the tank level wiring on my old rig to repair a FW auto fill relay problem.

All wires are in the overhead dash curbside. I am guessing that is where your problem might be and simpler to explore.

Tanks Control Wiring Scheme.pdf
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Old 10-22-2021, 12:10 PM   #9
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You could also consider upgrading to the Seelevel tank monitoring system. This system uses external sensors and measures from 0-100%.

You can see their products at

https://www.garnetinstruments.com/rv-shop/
Have heard about these systems gonna fiie it away for now
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Old 10-22-2021, 12:11 PM   #10
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This is what we will be doing over the winter. In addition to reprogramming the Silverleaf to work with our replaced inverter and adding the Silverleaf TPMS...

Still very curious about the tank removal though...

Ch
Please do a thread on your install would like to follow,
greg
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Old 10-22-2021, 12:14 PM   #11
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Quote:
Originally Posted by deandec View Post
I have not physically inspected the tank or the levels sensors. But, I have diagramed the tank level wiring on my old rig to repair a FW auto fill relay problem.

All wires are in the overhead dash curbside. I am guessing that is where your problem might be and simpler to explore.

Attachment 346726
Thanks saved the diagram
and yup I seen the wires 240-243 attached on the tank so hopefully the rest is true as well
But wonder how over fill in the tank affected something on the monitor...possibly caused an over current somehow ???
greg
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Old 10-22-2021, 12:23 PM   #12
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So who made the fresh water monitor system in our coaches with the E 1/4/ 1/2/ 3/4 and F Led lights that illuminate ....same ones are used to monitor other systems
Are they Country Coach made?

greg
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Old 10-22-2021, 12:30 PM   #13
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Please do a thread on your install would like to follow,

greg
Unfortunately TMC will be doing the install at thier shop in FL in conjunction with a bunch of winter service and re once overs.

I can discuss with them about maybe doing a YT vid.

Ch
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Old 10-22-2021, 01:10 PM   #14
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Well I'll be...

I had previously partially emptied the fresh water tank by filling grey tank to 3/4....45 gal?

But just finished draining the fresh water tank and it dumped alot of water out! and gages started dropping from full to 3/4 to 1/2 to 1/4 to Empty

have to run but will add some water back into tank later to see how things work

That tan must be a balloon!

Thanks for all the replies I have gained more knowledge on this ol rig,
greg
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