How do you replace the alternator on a 1999 Chevy Blazer S-10 4wd?

the alternator will be located close to the top of the motor, you will need to loosen the tensioner pulley and remove the serpentine belt, disconnect the elictrical connections at the alternator and remove the alternator mounting bolts. then just lift the alternator out... as far as tools you will need a basic set of sockets and a screwdriver.