Community Forums

GT7 Jim · 07-01-2020, 02:19 PM

Doing google research shows most sensor issues will show the level is more full even if the tank is empty.

Well, I have the opposite issue. The last 2 times our grey tank showed only 2/3 full, but we were getting water backed up in the shower. So its obviously very full.

I found all the grey tank sensors, all the wires look good.

Not sure where to look next.

Any suggestions on what to check next?

Thanks!

GT7 Jim · 07-01-2020, 02:21 PM

Oh, this is a new unit by the way.

This is our 3rd trip.

AlanTerry · 07-01-2020, 02:29 PM

Sounds like a warranty issue. Write it up and take it in.

GT7 Jim · 07-01-2020, 02:36 PM

Quote:

Originally Posted by AlanTerry

Sounds like a warranty issue. Write it up and take it in.

I like to see if I can figure it out myself first.

If not, then I'll take to dealer.

Now I'm trying to figure what type/brand of sensors they are so I can do some better google-ing.

Its a small black box with 4 purple wires going to the sensors in the tank.

keymastr · 07-01-2020, 07:29 PM

Check continuity of each wire. Most likely a bad crimp connection. Wiring is pretty amateur in most brands and often wires get strained or screws pierce them, or the connector just was not installed correctly.

Persistent · 07-02-2020, 08:48 AM

There are many sensor systems. The one that is common has conductor exposed inside the tank. The probes are mounted at different heights and signal when water contacts the probe and conducts to ground.

The full light may not be connected to the full probe.
The probes may not be connected to the correct lights on the panel.
There may be venting and/or plumbing faults in the gray tank.
There may be more than one gray tank and the indicator is for another tank.

I wish you good luck and happy trails ahead.

MSHappyCampers · 07-02-2020, 09:41 AM

The tank sensor control is our coach has individual adjustments for each tank.

GT7 Jim · 07-02-2020, 02:38 PM

Quote:

Originally Posted by Persistent

There are many sensor systems. The one that is common has conductor exposed inside the tank. The probes are mounted at different heights and signal when water contacts the probe and conducts to ground.

The full light may not be connected to the full probe.
The probes may not be connected to the correct lights on the panel.
There may be venting and/or plumbing faults in the gray tank.
There may be more than one gray tank and the indicator is for another tank.

I wish you good luck and happy trails ahead.

Thanks.

I have 1 grey tank and it did work properly for 1.5 trips.

So it was installed correctly, then stopped working properly.

Ted Lambert · 07-02-2020, 04:10 PM

Quote:

Originally Posted by MSHappyCampers

The tank sensor control is our coach has individual adjustments for each tank.

Yes I had an Evergreen trailer that needed calibration. Did it myself on the back of the panel

egwilly · 07-02-2020, 09:21 PM

The best way to check the probes is to use a jumper wire and cause each one on the tank to see ground. Then look at the panel to be sure they are wired correctly and in proper function.

If you ground say the lowest probe and you get nothing, then a wire is off or disconnected. These are very small wires they use on these.

I had to trouble shoot ours about 6 months in from new and found a crappy wiring job and loose crimps. Like you, I am not willing to goto a dealer and wait weeks for a repair I can do myself.

Best wishes!

danhannah · 07-03-2020, 01:57 AM

I had a similar issue - and it was a tiny component on the circuit board of the display panel. You likely have surface-mounted sensors, since it is a new rig, so clogging is not usually an issue.

It seems like only the "full" light is malfunctioning. That's an important one! Each light has its own component on the board, and that might explain why the "full" light is not working. If you ground the top sensor, like egwilly suggests, and the "full" light does not come on, look at a new circuit board...

Dav L · 07-03-2020, 03:56 AM

Without knowing what type of system, there is no diagnosis suggestions that make sense.

The two prevalent systems are sensors IN the tank that monitor by sensing what the water level is by conductivity. These are typically in older RVs.
The second sensor type has "foil" stuck onto the OUTSIDE of the tank that senses with capacitance the water level.

The second type there are multiple different brands that report back the level electronically to the control unit / display.

What brand is on the display?

Have you looked in your owner's kit for what type of system is installed?
Have you called the RV dealer / manufacturer for which type?

GT7 Jim · 07-03-2020, 07:09 AM

Quote:

Originally Posted by egwilly

The best way to check the probes is to use a jumper wire and cause each one on the tank to see ground. Then look at the panel to be sure they are wired correctly and in proper function.

If you ground say the lowest probe and you get nothing, then a wire is off or disconnected. These are very small wires they use on these.

I had to trouble shoot ours about 6 months in from new and found a crappy wiring job and loose crimps. Like you, I am not willing to goto a dealer and wait weeks for a repair I can do myself.

Best wishes!

Thanks!