2001 Chevrolet Venture electrical system problems

My 2001 chevrolet venture caught fire while in my garage. It burned to a total loss. It also caused a measure of smoke damage to my garage. The vehicle had 54,000 miles on it. The situation was extremely dangerous, as it could have caught my garage or even my home on fire. There were absolutely no warnings or indications that anything was wrong prior to the incident. It seems to be quite a defect.

My mother purchased the vehicle brand new in 2001, it has been a problem since she brought it home. Turn signals have never worked properly, headlights fill up with water causing them to burn out, interior lights don't work properly. I acquired the vehicle after her passing in 2012 . The van only has 66000 miles on it and I've had to replace the lights 6 times since I've had it. When she had it she took it back to the dealership several times only to have the same problems happen again.