Signs of a failing alternator can be an excessively noisy alternator, a burning smell coming from the alternator, and flickering of vehicle lights under electrical load. In this case, the car completely lost power while driving on the highway. The alternator is not too difficult to replace, however it does require some time. The drive belt needs to be removed and there are few difficult bolts to get to. However, it is a direct replacement so in all it can be done successfully if you take your time and do it right.