Black water tank light says 2/3 full after draining

[Alberta_Born]

2007 Jayco jayflight 29 foot travel trailer. Gone out twice so far and after use I drain the tanks but the light on the black water tank shows 2/3 full and after hearing the sewage water go down the hose it seems empty but the light shows 2/3 full I'm afraid to go out this weekend and get set up to find a nearly full tank.. Anyone have that problem?

[colliehauler]

Toilet paper an other stick to the sensor and give unreliable readings. Like others have said a through flush should clear it.

[Community Alumni]

In all the years and rv's we've owned, never had a black tank indicator that worked. I simply ignore it now and just dump about every 5 days or when we are ready to leave. The only indicators that have ever worked for me were the fresh water tank ones.

[mbopp]

Ditto on the toilet wand. My last 2 trailers had flush systems but I got a lot more "stuff" out after using a wand.

[Lynnmor]

Alberta Born wrote:
2007 Jayco jayflight 29 foot travel trailer. Gone out twice so far and after use I drain the tanks but the light on the black water tank shows 2/3 full and after hearing the sewage water go down the hose it seems empty but the light shows 2/3 full I'm afraid to go out this weekend and get set up to find a nearly full tank.. Anyone have that problem?

Almost everyone has that problem, the gauges are VERY unreliable. If you have a flush system it might clear the lights. If you do not have a flush system, get a wand that sticks down the toilet to clean the tank. Many just give up trying to keep them working.