So for those of you who know how to tinker around a bit on your car... When the battery discharge light comes on in your car, is there anything other than the alternator that can be the culprit? Basically, while the wife was driving the car, the battery light would intermittently come on and off, and it stayed on until it eventually died on her in a carpark (it wouldn't start after turning it off). After jump starting the car, I knocked the alternator a bit, and that turned the battery light off, so at that point, I was pretty sure that brush in the alternator was going off. I went and replaced it with another alternator found in a junkyard, but after a couple days, the battery light came back on (though it much less frequency). Could it be just a bad alternator I got in replacement? Or is there anything else I should be checking?