CTS Alternator Replacement

Introduction

This tutorial will guide you through the process of replacing the alternator in a 2013 Cadillac CTS. If you hear a whining noise and smell burnt plastic, it could indicate a failing alternator. This step-by-step guide will help you safely and effectively replace the alternator using an AC Delco part from Summit Racing.

Step 1: Disconnect the Battery

• Safety First: Always disconnect the negative terminal of the battery before beginning any work on the electrical system.
• Remove Engine Covers: If your vehicle has any plastic engine covers, remove them to gain better access to the alternator.

Step 2: Remove the Serpentine Belt

• Locate the Belt Tensioner: Find the belt tensioner, which is used to maintain tension on the serpentine belt.
• Loosen the Tensioner: Use a half-inch drive wrench to pull the tensioner towards the passenger side of the vehicle.
• Remove the Belt: Slip the belt off the alternator pulley and then off the top of the water pump.

Step 3: Disconnect Wiring

• Access the Wiring: Depending on your access, you may need to go underneath the car. Removing the plastic cover under the engine will provide better access.
• Unplug the Wiring Harness: Use a flat-bladed screwdriver to carefully push the locking tab on the wiring plug and disconnect it.
• Remove the Bolt: Unscrew the nut that secures the wire to the back of the alternator. This typically requires a 13mm wrench.

Step 4: Remove the Alternator

• Loosen the Alternator Bolts: There are usually two bolts at the top and two at the bottom of the alternator. Use a 15mm socket for these bolts.
  • Note: The lower bolts may need to be loosened first before fully removing them, as they can interfere with the car’s body.
• Extract the Alternator: Carefully shimmy the alternator out through the engine bay. Be cautious not to damage any hoses or components in the process.

Step 5: Install the New Alternator

• Position the New Alternator: Place the new alternator into position, ensuring it fits through the same pathway as the old one.
• Secure the Bolts: Reinstall the bolts in the reverse order of removal. Ensure they are tightened securely.
• Reconnect the Wiring: Reattach the wiring harness and bolt it to the back of the alternator.

Step 6: Reinstall the Serpentine Belt

• Reattach the Belt: Slip the serpentine belt back onto the alternator and water pump pulleys, ensuring it is properly seated on all pulleys.

Step 7: Reconnect the Battery

• Reconnect the Battery Terminal: Once everything is reassembled, reconnect the negative battery terminal.

Conclusion

Replacing the alternator in your Cadillac CTS can be done with some basic tools and patience. Ensure all connections are secure and the belt is properly installed. After completing the installation, start the vehicle to check for any unusual noises or warning lights. If everything is operating smoothly, you have successfully replaced the alternator. For further maintenance, consider consulting your vehicle's manual or a professional mechanic for any additional checks or services.