A few days ago, the mark viii fan in my 5.0 quit working. I found that the ground terminal on the connector and on the fan motor itself had melted. I use a DCC controller, the wiring and splices are all fine. Since I assume this is not a common problem, I'm guessing that the fan windings shorted out causing excessive current draw. My question is: Will this happen again? Or was this just a fluke?