Car dies when air conditioner is on

So is it still not charging?

It will run until I turn on the air then it dies.

Have you checked to see if the alternator is charging? you mentioned you replaced the alternator and battery why were those replaced? Also how did it run before those were replaced?

Yes seems to be charging. My daughter drop it one day and then it just would not start so bought a new battery still nothing, so I changed the alternator which was bad and now it will run but dies when you turn on the air conditioner. No problems before.

Lets check and see what the voltage is at the battery with it running then with the headlights on etc? I have seen new alternators bad. I replaced the alternator in my car last August then had to replace the one i put in on Easter morning. Also lately I have gotten a lot of new parts bad right out of the box.

Is it possible my air compressor is bad?

It is, but you said it was fine before you replaced the alternator.Unless you were not using the air conditioner? With the engine off see if the center of the air conditioner compressor pulley turns with not a lot of effort.