I could give you a more specific answer if you told me which engine your car has, but hopefully this will work:
1. Disconnect the battery ground. Use gloves to keep from getting any acid on your skin.
2. Take note of the routing of the serpentine belt and release the tensioner, move the belt out of the way.
3. Disconnect the wires from the alternator.
4. Remove the bolts that hold the alternator in and lift it out.
Reverse the procedure to put it back.
There is no fuse on the alternator.
No Chevy Celebrity ever had a 4.0L engine
Which engine does your car have?
The petcock on a 1989 Chevy Celebrity is at the bottom of the radiator on the drivers side.
Pull the old fuse out and put the replacement fuse in.
No, there is not a fuse on the alternator.
To change the front blinker bulb on your 1989 Chevy Celebrity simply reach up behind the bumper and unplug the socket from the fixture. Replace the bulb in the socket and plug the socket back into the fixture.
How to change the power steering pump depends on which engine your car has.
The oxygen sensor on a 1989 Chevy Celebrity is located in the rear exhaust manifold on top about the center.
Begin by removing the alternator belt on your 1989 Chevy Corsica. Remove the wiring harness from the back of the alternator. Remove the alternator retaining bolts. Reverse the process to install the new alternator.
You can replace the ignition control module and the crankshaft position sensor as required.
Looking in my factory service manual for a 1989 Chevy Celebrity I found no reference to an accessory relay.