I broke my driver rear tail light cover July 20. Light still worked fine so didn't rush to replace it. In late Oct was driving car in town and everything started shutting down. Called BMW dealer and spoke to service rep and he said to stop car and have it towed. Got home and waited until next AM to see about towning the !!0 miles to dealership and no battery at all. Couldn't even unlock doors. Looked in opening over driver rear wheel well and it is filled with water. Dealer tells me it's my fault everything died because lens cover let water in. All electronics and battery are fried! Talked to BMW North America and they said they rely on dealer diagnosis and will do nothing! This is very costly and it seems totally unreasonable that the entire would die because of a broken tail light cover. The dealership and I are at a statemate. They say I have to pay. Any ideas? I have previous experience with this same problem but with a different car. The source of the leak was never found and the same problem reoccurred 4 times and the car was eventually replaced. I think the broken tail light is a convenient excuse not to do anything. I have read of this same issue in other forums. What eventually happened to those cars? Did the owners have to pay? I have one year left on my warranty but will be overseas for 5 months during this upcoming year. Each time it happened with the other car it took several months to happen. Any advice is appreciated. I am at my wits end. Oh, this is a 535i Wagon 2010.