Tools you'll likely need:
* Socket wrench set (metric): You'll need various sizes, likely including 10mm, 13mm, 15mm, and possibly others.
* Ratchets and extensions: To reach those hard-to-access bolts.
* Wrench (possibly): Some bolts may be easier to access with a wrench.
* Screwdrivers (Phillips and possibly flathead): For various fasteners.
* Pliers: For disconnecting electrical connectors.
* Jack and jack stands: To safely lift the car.
* Wheel chocks: For added safety.
* New alternator: Make sure you get the correct one for your specific Alero engine.
* Gloves: Protect your hands.
* Safety glasses: Protect your eyes.
* Wires or a battery terminal cleaner: Clean battery terminals and any connections before reconnecting the battery.
* Torque wrench (optional but recommended): For tightening bolts to the manufacturer's specifications.
* Shop manual: A repair manual specific to your 1999 Oldsmobile Alero is highly recommended. It will have detailed diagrams and torque specifications.
General Steps (Consult your repair manual for precise details and diagrams):
1. Disconnect the Battery: Disconnect the negative (-) battery cable first, then the positive (+) cable.
2. Access the Alternator: This is usually located on the front of the engine, towards the bottom. You may need to remove some components for better access. This might include:
* Serpentine belt: This will need to be removed. You'll likely need a serpentine belt wrench or a special tool to loosen the tensioner.
* Air intake components: Some air intake parts might need to be moved or removed.
* Other components: Depending on your specific Alero and access, you might need to move or partially remove other things like the power steering pump, etc. This is why a repair manual is invaluable.
3. Disconnect the Electrical Connections: Carefully disconnect the electrical connectors from the alternator. Take note of their positions for reassembly. Sometimes these connectors are stubborn and may require some gentle persuasion.
4. Remove the Alternator Mounting Bolts: Loosen and remove the bolts holding the alternator to the engine block. These are usually two or three bolts.
5. Remove the Alternator: Carefully remove the alternator from its mounting location. It might be a little heavy.
6. Install the New Alternator:
* Position the new alternator in the mounting location.
* Attach the mounting bolts.
* Connect the electrical connectors.
* Install the serpentine belt (if removed). Ensure proper routing.
7. Reconnect the Battery: Reconnect the positive (+) battery cable, then the negative (-) cable.
8. Test the Alternator: Start the engine and check the battery voltage with a multimeter. The voltage should be above 13.5 volts while the engine is running. If not, there might be a problem with the new alternator or other components in the charging system.
Important Considerations:
* Serpentine Belt Tensioner: Be careful when removing and installing the serpentine belt. Incorrect tension can damage the belt and other components.
* Proper Belt Routing: Pay close attention to the correct routing of the serpentine belt. A misrouted belt will cause problems.
* Torque Specifications: Tighten all bolts to the manufacturer's specifications to avoid damage. A torque wrench is strongly recommended.
Disclaimer: This is a general guide. Replacing an alternator can be complex and requires mechanical skill. If you are not comfortable performing this repair, it's best to take your vehicle to a qualified mechanic. Incorrectly installing the alternator could damage your vehicle's electrical system or cause further problems. Always consult a repair manual specific to your 1999 Oldsmobile Alero for detailed instructions and diagrams.
