Gere is the problem that just started to happen. Have a 2002 2.0L Focus wagon, and the battery light started to come on. So I got ittested and it turned out the battery was not supplying enough power. You would think a no brainer! Well once the battery was replaced, the battery light comes on and off all the time. It is wierd, it does not come on when I hit a bumb, and it is totally random. I could be coasting, and it would come on, or next time it will not. The alternator is putting enough power out when it was tested, other then a bad battery, what else could it be?? Please help.