The photo isn't very clear, but I think I see side load wear on the brushes. They are made from carbon, so they don't melt, but it could look that way in the fuzzy picture because the slip rings are out of round or deeply grooved and the end play on the bearing has increased significantly.
Edit: I see your second photo now, clearly. I think your alt is in need of a rebuild.
Lamp test mode (check owners manual) switch to KP-II and see all the warning lamps on. This is so you know the light bulbs are good. Three of them besides the battery lamp depend on the alt for lamp test: Bulb failure, brake failure, and parking brake.
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Art Benstein near Baltimore
You know that indestructible black box that is used on airplanes? Why don't they make the whole plane out of that stuff?!
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