2003-2008 Lexus RX330/RX350/V6 Highlander Alternator Replacement

Introduction

This tutorial guides you through the process of replacing the alternator in a 2003-2008 Lexus RX330 or RX350, which is similar to the V6 Highlander model. A functioning alternator is crucial for charging the battery and powering electrical systems in your vehicle. Following these steps will help you complete the replacement efficiently.

Step 1: Gather Your Tools and Parts

Before starting the replacement, ensure you have the following tools and parts:

Tools Needed

• Torque wrench
• Pry bars
• Ratchets and socket sets (3/8" and 1/2" drive)
• Gloves
• Pick set

Parts Needed

• Alternator (choose based on your model):
  • RX330 130Amp Denso 210-1068 Reman Alternator
  • RX330 Bosch Automotive 0986UR0047 Alternator
  • RX350 130Amp Denso 210-1129 Remanufactured Alternator
• Belts (if needed):
  • RX330 Alternator/AC Belt
  • RX330 Power Steering Belt
  • RX350 Serpentine Belt

Practical Tip

Purchase parts from reputable suppliers to ensure quality and proper fit.

Step 2: Disconnect the Battery

1. Open the hood and locate the battery.
2. Use a wrench to disconnect the negative terminal first to prevent any electrical shorts.
3. Secure the cable away from the battery terminal.

Step 3: Remove the Serpentine Belt

1. Locate the tensioner pulley.
2. Use a ratchet to relieve tension on the tensioner.
3. Slide the belt off the alternator pulley.
4. If you're working with the RX350, this step will be easier, as you only need to release the tension.

Common Pitfall

Ensure the tensioner is fully released before attempting to remove the belt to avoid damaging the belt or tensioner.

Step 4: Remove the Alternator

1. Disconnect the electrical connectors from the alternator.
2. Remove the mounting bolts securing the alternator in place using the appropriate socket.
3. Gently pull the alternator out of its mounting position.

Practical Tip

Take note of the bolt locations and any brackets to ensure correct reassembly.

Step 5: Install the New Alternator

1. Position the new alternator in the same mounting location.
2. Secure it with the mounting bolts, tightening them to manufacturer specifications using a torque wrench.
3. Reconnect the electrical connectors.

Step 6: Reinstall the Serpentine Belt

1. Using the ratchet, release the tension on the tensioner again.
2. Slide the belt back onto the alternator pulley and ensure it is correctly routed over all pulleys.
3. Release the tensioner to apply tension to the belt.

Step 7: Reconnect the Battery

1. Connect the positive terminal first, followed by the negative terminal.
2. Ensure all connections are tight.

Step 8: Test the New Alternator

1. Start the engine and check for any unusual noises.
2. Use a multimeter to verify that the alternator is charging the battery properly (should read around 13.8 to 14.5 volts).

Conclusion

Replacing the alternator in your Lexus RX330 or RX350 can be a straightforward task with the right tools and steps. Always ensure safety by disconnecting the battery first and double-checking your work before starting the engine. If you encounter any issues, consider consulting a professional mechanic for assistance. Happy repairing!