Before You Begin:
* Safety First: Disconnect the negative battery cable before starting any work on the electrical system.
* Gather Tools: You'll need a socket set (metric), wrenches (metric), a ratchet, extensions, possibly a breaker bar for stubborn bolts, a battery terminal cleaner, and potentially a pulley puller depending on how difficult the alternator is to remove.
* Repair Manual: A Haynes or Chilton manual for your specific Fiero year and model is invaluable. It will provide diagrams and precise instructions tailored to your car.
* Jack Stands: Securely lift the Fiero and use jack stands to support it safely. Never work under a car supported only by a jack.
General Steps (May Vary Slightly Depending on Engine):
1. Access the Alternator: The alternator's location varies slightly depending on the engine type (2.0L or 2.8L). Generally, you'll need to access it from the front of the engine compartment. You may need to remove some components for better access; your repair manual will detail this. This might include removing the air intake system, possibly the fan shroud, or other components.
2. Disconnect the Electrical Connections: Carefully disconnect the alternator's wiring harness. Take photos or make notes to ensure you reconnect everything correctly. There will likely be at least two wires, plus the large power cable. Use a battery terminal cleaner to ensure good connections when reassembling.
3. Disconnect the Belt: Loosen the alternator's belt tensioner. The method for doing this varies depending on the Fiero model, so check your repair manual. Once the tension is relieved, remove the serpentine belt from the alternator pulley.
4. Remove the Alternator Mounting Bolts: The alternator is usually held in place by two or three bolts. These can be quite stubborn, so be prepared to use a breaker bar if necessary.
5. Remove the Alternator: Once the bolts are removed, carefully remove the alternator. It might be slightly tight due to its position, so take your time and use appropriate leverage.
6. Install the New Alternator: Carefully install the new alternator, making sure it sits correctly in its mounting brackets. Replace the mounting bolts and tighten them to the manufacturer's specifications (found in your repair manual).
7. Reconnect the Belt: Reinstall the serpentine belt, ensuring it's properly routed around all the pulleys. Tighten the belt tensioner.
8. Reconnect the Electrical Connections: Reconnect the alternator's wiring harness, making sure everything is secure.
9. Reconnect the Battery Cable: Reconnect the negative battery cable.
10. Test the Alternator: Start the engine and check the charging system voltage with a multimeter. It should be within the normal range (typically around 13.5-14.5 volts). If the voltage is incorrect, double-check all connections.
Important Considerations:
* Pulley Removal: In some cases, the pulley may need to be removed from the alternator before installation. This requires a specific pulley puller tool.
* Torque Specifications: Always tighten bolts to the proper torque specifications as listed in your repair manual. Over-tightening can damage components.
* Belt Routing: Make absolutely sure the serpentine belt is routed correctly. Incorrect routing can damage the belt and other components.
This is a general guideline. A detailed repair manual specific to your 1988 Pontiac Fiero is absolutely essential for success. Attempting this without one increases the risk of damage to your vehicle or personal injury. If you are not comfortable with automotive repair, consider taking it to a qualified mechanic.
