I was driving the Dart to work today and I was going up a long grade doing about 60 and I noticed that the Ammeter was showing a slight discharge condition. When I got to the top of the hill and lifted suddenly it shot back over to the charge side of center. I was really close to work so I didn't get a chance to really play with it much but I came to the finding that when I give it at least half throttle or more the gauge dips into discharge. When I got to work and popped the hood, nothing seemed out of order.
On the way home it started doing it again, but it took roughly 8 minutes of driving to start and this time it got progressively worse just as i was arriving home (13 minute drive) I took this video.
At the start of the video when the needle is jumping around, I was gently accelerating up a slight grade from a stop. If you turn the sound up, you can hear me getting in and out to the throttle twice near the end. What you can't hear is the engine misfiring during the discharge condition which was a new symptom.
