monitor reading incorrectly

we recently purchased a 2009 north trail, first trip we were fine but
next trip our monitor shows our gray 1 tank is 2/3 full after we empty all tanks, any suggestion
gary& carolyn mckee

Yep. Ignore the monitors. When your toilet burps, empty the black tank. When you see water backing up in the sink or shower, empty the appropriate gray tank.
You could also search for the Geo method. Some claim good luck with this.

Some people have suggested filling your tank fairly full and adding some dawn before you travel then dump when you arrive. It cleans the sensors. Just a thought.

GREG

The biggest problem is the sensors are in the tank. There is a product call Seelevel gauges. They mount to the outside of the holding tanks so stuff does not get stuck on them. I have read about them and considering putting them on my BH. Here is a review of a person that installed a set on his motorhome.

http://irv2.infopop.cc/eve/forums/a/tpc/f/2156094452/m/38510656441

Bill

In addition to false readings on my tank monitors from time to time - my gray and black tanks at the rear of my Cyclone are monitored separately from the front. The monitor always showed my washer/dryer draining into the BLACK tank. This couldn't be correct...so I took off the front of the monitor panel and carefully pulled the wires out of the wall and swapped the BROWN and GRAY wires at the wire nuts. 2 minute fix!

Now...I need to re-mark the dump handle pulls outside! I marked them according to the monitor...not the actual tank they were dumping!