Electrical problem Jeep Grand Cherokee WJ 2000

Hello, how are you? I need help with a Grand Cherokee that discharges the battery, and when using some accessory, such as the mechanisms of the seats (since it has electrical adjustment) or high volume in the audio player (original audio) the lights fall a lot of intensity, both those of the habitaculus and those of driving, although it does not present failures in the ignition is very uncomfortable, I would appreciate your help very much since I am studying mechanical electricity.

Thanks in advance.

First Czech the load that the alternator sends if it is not the right one effects you that way, now if you had an audio as well as amplified and things like that, you will have to check or put and cable to extra ground from battery to compensate for the drop in consumption, but the first alternator.