My 1997 Taurus has symptoms like a bad battery or alternator, yet I've replaced them both and still have the problem. The battery isn't charging and won't start the car, especially after driving the car for a while. A jump will get it back up to where it will start. Also, if the car sits for a while it will start. But when running, the headlights are bright and there seems to be enough power.
Any suggestions?