How do you replace the alternator on a 1998 Nissan Altima?

Always remove the ground wire on the battery first! Then, loosen the belt and slide it off of the alternator wheel. Unplug the alternator. Remove the mounting bolts. Remove the alternator. Reverse the process for installation. BE SURE TO PLUG THE BATT BACK IN. It happens more often than you think ;)

..and be sure to carefully look at how the alternator belt is routed over and around the pulleys. The belt is a "serpertine" type and is a pain to figure out!!!!