well i replaced the alternator and the battery and my battery light is still on, i took it to get my car checked at advance and they said there was absolutely no charge going to the battery, however i've been driving my lude for about a day, with a/c on full blast and my system on too, and there is no noticeable loss of power at all, anyone know what it could be?

 

You're battery doesn't power the car when it's running, the alternator does. The battery helps smooth ripples and is actually a load (drain) on the alternator. As long as the battery has enough power to start the car and get the engine going, you could disconnect it and the car will still run (FYI> NOT the best idea with cars that have computers). It is possible your battery isn't charging, but you'd find out after a few times of starting and shutting off the motor

 

It sounds like a bad connection between the alternator and the battery.