1990 Chevy Lumina removing alternator

REMOVAL:
Disconnect the negative battery cable.
Remove the serpentine drive belt
Unfasten the rear bracket/heat shield nuts from the exhaust manifold.
Remove the rear bracket/heat shield bolts from the block, near the water pump.
Unfasten the rear bracket/heat shield retaining nuts at the alternator, then remove the bracket/heat shield.
Detach the electrical connections from the alternator, including the battery positive lead and the nuts from the alternator output (BAT) terminal.
Unfasten the front attaching bolts, then remove the alternator from the vehicle.

INSTALLATION:
Position the alternator in the vehicle, then secure using the retaining bolts. Tighten the long bolt to 37 ft. Lbs. (50 Nm) and the short bolt to 18 ft. Lbs. (25 Nm).
Fasten the battery positive lead and nut to the alternator output terminal and tighten to 70 inch lbs. (8 Nm).
Attach the electrical connector to the alternator.
Position the rear bracket/heat shield, then install the retaining bolt at the alternator. Tighten the bolt to 18 ft. Lbs. (25 Nm).
Fasten the rear bracket/heat shield bolts to the block, near the water pump. Tighten to 63 ft. Lbs. (85 Nm). Install the bracket/shield-to-exhaust manifold nuts and tighten to 37 ft. Lbs. (50 Nm).
Install the serpentine drive belt, as outlined in of this repair guide.
Connect the negative battery cable.