Grey water tank

[Shagginwaggin0389]

Hello all I have a 274 dbh tt and am confused. My grey water tank indicator light is reading 2/3 full but have not used tt in over a week. Tanks emptied before we closed up after our last trip. Any help with why would be appreciated.
Thanks

[Flybob]

The level indicators on black and grey tanks are notoriously incorrect. The system consists of 3-4 metal sensors ( many times just screws) in specific positions in the tank. When the liquid in the tank reaches a sensor it conducts electricity back to the display panel. If a piece of crud ( food, paper, etc) gets stuck on the sensor, it conducts to the damp sides of the tank and appears to be a liquid level. Deciding when to empty your tanks is a combination of indicator readings and understanding roughly how much liquid was put in the tank. Sometimes cleaning the tank works and sometimes it doesn't.

[Shagginwaggin0389]

Thanks Flybob

[bridgekev]

My level indicators are all over the place too. I've dumped, verified they show empty, then drove to another location only to find they are showing various levels. I have found that as the tanks fill, it gets more accurate.