Black Tank Readings Not Possible
So we took our new to us 5er out on it's maiden voyage to a campground with full hookups about two hours from home. I check the tank levels the morning after our late night arrival and all the tanks ...
Forum Discussion
You have already discovered the only reliable way to determine the level in the black tank - open the toilet drain valve and take a look. A flashlight is often helpful in doing this. Just don't drop it into the tank.
