Smoking alternator

Wow how ironic. I was driving my work van home on 40 on Friday and I smelled something burning, pulled off the exit and opened the hood... my alternator was on FIRE!!!!! Put it out with the extinguisher I carry in my truck. No real damage except the alternator and plastic plugs at the ends of the wires. Bearings were so worn out that the alternator just literally caught on fire, Replaced the plugs and new alternator, cleaned up all the extinguisher powder and back on the road!!!! Always carry an extinguisher with you. If I did not have one I would have lost my work van and all my tools.
i have extinguisher in every car i own,work van has 3,my van goes up i would lose all my tools too.