Thor Forums

[Badmanrick]

I had a Bullet Premier travel trailer and had the same problem. It had the button tank sensors in all tanks, black, gray, & Fresh. Skum collects on the side of the tanks and shorts out the sensors so they show incorrect readings.
These sensors are the cheapest sensors that the factory can install.
I changed all mine with the Horst extended sensors from Valtera. They worked a lot better.
When I upgraded to our new 2019 Thor Hurricane34j I immediately change the sensors out.
The black tank sensors must be installed with the opening facing down. The gray/fresh sensors do not have a cover but stick about 3” inches into the tank like the black sensors.
There are other very expensive alternatives which you can check out on you tube.
I purchased mine from Amazon