Tools You'll Likely Need:
* Socket wrench set: Various sizes, including metric and possibly SAE.
* Ratchets: Both 3/8" and 1/2" drive are helpful.
* Wrench set: Open-ended and combination wrenches.
* Screwdrivers: Phillips and flathead.
* Pliers: Needle-nose and regular.
* Jack and jack stands: Essential for safety. Never work under a car supported only by a jack.
* Wheel chocks: To secure the car.
* Battery terminal cleaner: For cleaning battery posts.
* Wires: Jump wires, to aid in diagnosing if necessary.
* Alternator removal tool: This may be needed to remove the alternator pulley.
General Steps (This is NOT a complete guide, use a repair manual!):
1. Disconnect the Battery: This is the MOST important step. Disconnect the negative (-) terminal first, then the positive (+) terminal. This prevents electrical shorts and injury.
2. Access the Alternator: This usually involves removing some components like the air intake system, or parts of the under-hood shielding to gain access to the alternator. Consult your repair manual for specific steps for your vehicle. You may need to remove the serpentine belt as well.
3. Remove the Serpentine Belt: Use a belt tensioner tool to release the tension on the belt, allowing you to slip it off the alternator pulley and other pulleys. If you're unsure about this step, it's best to consult a repair manual for detailed instructions on your specific vehicle. Using a belt tensioner tool is usually much safer and simpler than attempting to route the belt around the pulleys by hand.
4. Disconnect Electrical Connections: Unplug the electrical connector from the alternator. There's usually a single large connector.
5. Remove Mounting Bolts: The alternator is typically held in place by several bolts. Loosen and remove these bolts using the appropriate socket or wrench.
6. Remove the Alternator: Once the bolts are removed, carefully remove the alternator. It might be a little heavy.
7. Install the New Alternator: This is the reverse of the removal process. Ensure everything is properly connected and tightened securely.
8. Reinstall the Serpentine Belt: Carefully route the serpentine belt back onto all the pulleys, ensuring it's correctly seated. Once again, a repair manual or experienced mechanic is recommended.
9. Reconnect the Battery: Reconnect the positive (+) terminal first, then the negative (-) terminal.
10. Test the Alternator: Start the engine and check that the alternator is charging the battery properly using a multimeter. The voltage should read around 13.5-14.5 volts at idle.
Important Considerations:
* Serpentine Belt Routing: Getting the serpentine belt back on correctly is crucial. Incorrect routing can cause damage to the belt and other components. A diagram from your repair manual is invaluable.
* Bolt Tightening: Use the correct torque specifications for all bolts to prevent damage. This information is usually found in your repair manual.
* Pulley Removal: In some cases, the alternator pulley needs to be removed separately. This often requires a special tool.
This is a simplified explanation. Improperly performing this repair can result in damage to your vehicle or personal injury. If you are not comfortable performing this task, take your vehicle to a qualified mechanic. A repair manual specific to your 1999 Ford Mystique is your best resource. You can often find these online or at auto parts stores.
