I've tried 2 different cord's, and at two different houses. I plug it in for the whole night, and in the morning, the wts light stay's on forever, like it isn't plugged in. I had an issue with it earlier this winter. I kept tripping the breaker everytime I would plug it in. A couple day's before that started happening, It almost seemed like the block heater was working too good. Almost no wait, and I had heat almost right away! I think it's fried!