Tools You'll Need:
* Socket wrench set (metric)
* Wrenches (metric)
* Ratchet and extensions
* Pliers
* Screwdrivers (Phillips and flathead)
* Battery terminal cleaner
* New alternator (ensure you get the correct one for your Fiero's engine)
* Jack and jack stands (crucial for safety!)
* Wheel chocks
* Safety glasses
* Gloves
Procedure:
1. Safety First: Disconnect the negative battery cable. This is crucial to prevent electrical shocks and short circuits.
2. Access the Alternator: The alternator's location varies slightly depending on the engine. Generally, it's on the front of the engine, near the passenger side (right side). You may need to remove some components to gain better access. This might include:
* Removing the serpentine belt: Use a belt tensioner tool (or the appropriate method for your Fiero's tensioner system) to release tension on the belt and remove it from the alternator pulley and other pulleys.
* Removing the air cleaner assembly (possibly): This might be necessary for better access.
* Unbolting other components (possibly): Depending on your Fiero, you might need to loosen or remove other parts to reach the alternator bolts easily. Refer to your repair manual for specifics.
3. Disconnect the Electrical Connections:
* Carefully disconnect the alternator's wiring harness connector. Take a picture or note the position of each wire before disconnecting to ensure correct reconnection.
* Loosen and remove the alternator's mounting bolts. There are typically two or three bolts securing the alternator to the engine.
4. Remove the Alternator: Once the bolts are loose, carefully remove the alternator from its mounting position. It may be somewhat heavy.
5. Install the New Alternator:
* Carefully install the new alternator in the same position as the old one.
* Secure it with the mounting bolts, tightening them to the manufacturer's specifications (found in your repair manual).
* Reconnect the wiring harness connector, ensuring each wire is in its correct position.
6. Reconnect the Serpentine Belt: Carefully route the serpentine belt back onto all the pulleys, including the alternator's pulley. Ensure the belt is properly seated and tensioned correctly, again referring to your repair manual for proper tension. Use a belt tensioner tool if needed.
7. Reconnect the Battery Cable: Reconnect the negative battery cable.
8. Test the Alternator: Start the engine and check the alternator's output voltage using a multimeter. The voltage should be around 13.5 to 14.5 volts when the engine is running. If the voltage is low or fluctuating, there may be a problem with the new alternator or the charging system.
9. Double Check: After everything is reconnected, double-check all connections to ensure everything is tight and secure.
Important Considerations:
* Repair Manual: A repair manual specific to your 1985 Pontiac Fiero is invaluable. It will provide detailed diagrams, torque specifications, and step-by-step instructions tailored to your vehicle.
* Electrical Safety: Always disconnect the negative battery cable before working on any electrical components.
* Jack Stands: Always use jack stands to support the vehicle when working underneath it. Never rely solely on a jack.
* Torque Specifications: Over-tightening or under-tightening bolts can damage components. Always use the correct torque specifications from your repair manual.
This guide provides a general overview. The specific steps and challenges may vary slightly depending on your specific Fiero model and engine. Always prioritize safety and consult your repair manual for the most accurate and detailed instructions. If you're not comfortable performing this repair yourself, it's best to take your Fiero to a qualified mechanic.
