All ActivityMost RecentMost LikesSolutionsStarting GeneratorI'm sure this has been asked before but I can't find it. I have a 2000 winnebago minnie 31C and I'm not sure which battery starts the generator. Is it the truck( chassis ) or the coach deep cycle batteries?Re: Holding Tank Filled OvernightAfter checking the bathroom sink, as many of you said, it does drain into the black water tank, so it looks like the bathroom faucet was my problem. Replaced bathroom and kitchen faucets with residential ones. I had city water hooked up all day and had no problems. Thanks for all the information.Re: Holding Tank Filled OvernightI didn't mean to confuse anyone when I said toilet wouldn't flush, I meant I couldn't flush it because when I did the tank was so full the bowl just filled up. The bathroom faucet did drip all night but I don't know what tank it drains into.We didn't do any dishes or take any showers so I don't think water usage was the issue. From your responses it sounds like level indicator for black tank is faulty and bathroom faucet dripping all night may be the cause.Holding Tank Filled OvernightWe went to a local campground last night to check out our ( new to us ) 2000 Winnebago Minnie 31C. Before we left home I checked control panel for holding tanks and it said both black and grey tanks were empty, I even pulled lever on grey water tank to make sure and it was empty. We hooked up to campground water and electric ( no sewer hookup ) to test everything. We ran a little water in sinks and flushed toilet six times. By morning black tank was full, toilet would not flush and grey tank was at least half full when I went to dump station. I don't know if I did something wrong or if I didn't do something I should have or if I have a major problem. Any ideas would be helpful.