Repairing an alternator means that all defective parts are replaced. Only the replacement of one or two parts in an alternator that has already failed can be only a temporary correction. Rebuilding. Rebuilding an alternator is a process more involved.

You can repair or take it to a repair laboratory. The alternator repair is not too difficult, but you certainly need a diagram of the serpentine belt so you can put it right.

Repairing the alternator is not too difficult, but you will definitely need a serpentine waist chart so you can put it back correctly.

Repairing the alternator is not very difficult, but it will certainly require a serpentine waist chart so you can replenish it.

You don't need to change the alternator if you bought a new battery to replace the old one you bit. After installing a new battery, a few days after the new battery, means that the alternator is not good, do not recharge the new battery.