Originally posted by SteveG:
I have searched for some information on fixing our 2004 True Level tank monitoring system. I found the Sea Level mods. But has anyone done or considered doing the aftermarket installation of True Level Tank Monitoring using the Mirus detector cells that Winnebago has used since 2005? The Mirus cells and boards are supposed to be available from Winnebago dealers.
I saw this mod in the May 2005 Wit Club article.
I replaced the old Ventline system in my Sightseer with the TruLevel system in 2006. I bought it and installed while we were at the factory for warranty work.
The installation is very simple since the existing connectors and wires are used.
Getting access to the side of my grey water tank was a little bit of a challenge since an access panel had to be removed. There were about ten screws and the door lift pistons had to be removed so the door could be lifted up for access to the screws along the top. There is a very aggressive black sealant used on the panel and I found I had to pull the panel out and use shears to cut it.
The Ventline pc board is replaced with a new one but that's easy. The pc board connector plugged ito the new pc board and the new board mounted in the same place as the old one.
The old sensors just unplugged and the new ones plugged into the same connectors.
The bad news is that the system did not work properly on the black and grey tanks.
There was enough crud built up on the walls of the tank to fool the system.
Winnebago at no charge to me tried to fix the system - replaced the pc board, one set of sensors and checked the position of the sensor wiring (it's not supposed to be real close to metal) - all to no avail.
I decided to keep it although they offered to refund my money.
I pressure washed the black water tank and got it to work. I used various cleaners on the grey water tank and the last one - TSP - seemed to do the trick. (The "Geo" method did nothing.)
Now the bottom 1/3 LED still stays lit when the tanks are empty, but the most important ones work okay.
I have found that I need to add a cap of liquid Tide to the tanks after I empty them. That seems to keep them clean enough to work.
I don't add it to grey tank unless we are traveling since I leave it open while we are stopped. I use Tide because that's what DW uses and it's handy.
For what it's worth, my friend Bud bought another brand of system - I don't recall the name but it shows percent full - and he has the same problem with his