How to Replace the Alternator in a 2012 Chevy Malibu

Chevrolet Models Chevrolet Malibu
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Replacing the alternator in your 2012 Chevy Malibu can seem daunting, but with the right tools and a bit of guidance, it’s definitely a doable DIY project. Here’s a step-by-step tutorial to help you through the process.

Tools You’ll Need:

  • Socket wrench set
  • Ratchet
  • Torque wrench
  • Pliers
  • Flathead screwdriver
  • Replacement alternator
  • Safety glasses
  • Gloves

Step 1: Safety First

Make sure the engine is off, and the keys are out of the ignition. Disconnect the negative battery terminal to avoid any electrical shocks while you work.

Step 2: Remove the Engine Cover

If your Malibu has an engine cover, remove it by loosening any screws or clips holding it in place. This will give you clearer access to the alternator.

Step 3: Locate the Alternator

The alternator is typically located on the top right side of the engine bay. Familiarize yourself with its position, as it will help when identifying which bolts to remove.

Step 4: Disconnect the Wiring Harness

Carefully unplug the electrical connector from the alternator. You may need a flathead screwdriver to help pry it free. Also, remove the positive cable connected to the alternator.

Step 5: Remove the Belts

Before taking out the alternator, you’ll need to remove the serpentine belt. Locate the tensioner pulley and use a wrench to relieve tension before sliding the belt off the alternator pulley.

Step 6: Unbolt the Alternator

There are usually two or three bolts securing the alternator in place. Use your socket wrench to remove them. Be mindful of any washers that may be attached to these bolts.

Step 7: Take Out the Alternator

Once the bolts are removed, gently wiggle the alternator free from its bracket. Take care not to damage any surrounding components while doing this.

Step 8: Install the New Alternator

Position the new alternator into the bracket and secure it with the bolts. Make sure to torque the bolts to the manufacturer’s specs (usually found in the owner’s manual).

Step 9: Reattach the Wiring

Reconnect the electrical connector and positive cable to the new alternator, ensuring it clicks into place securely.

Step 10: Reinstall the Belts and Engine Cover

Place the serpentine belt back on the alternator and ensure it’s seated properly on all pulleys. If you removed an engine cover, put that back on as well.

Step 11: Reconnect the Battery

Reconnect the negative battery terminal, ensuring it’s tightly secured.

Step 12: Test the Installation

Start your vehicle and check if the alternator is functioning properly. You can use a multimeter to check the voltage output; it should be between 13.5 to 14.5 volts with the engine running.

Conclusion

Replacing the alternator in your 2012 Chevy Malibu can save you a significant amount of money if you do it yourself. Plus, you’ll have the satisfaction of knowing you did the work! If you encounter any hiccups during the process, check out video tutorials or feel free to ask for help here in the forum.

Happy wrenching!

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Here’s a detailed list of tools you’ll need to replace the alternator in a 2012 Chevy Malibu: 10mm socket, 13mm socket, 15mm wrench, and a belt tensioner tool. Don’t forget safety glasses and gloves! Safety first!

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Great list! I would also recommend having some PB Blaster handy to loosen any stubborn bolts. It makes the job easier!

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I found that using a 3/8 ratchet really speeds things up when working on the alternator. Pro tip: some bolts are under tight spaces, so a short socket might also come in handy.

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Absolutely! PB Blaster has saved me a lot of time on various projects. What size is the bolt holding the alternator bracket?

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The alternator bracket bolts are typically 15mm. Be careful when removing them; they can be quite tight!

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Yes! I always wear long sleeves too. You never know when a sharp edge might try to get you!

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Is it really that complicated? I thought replacing an alternator was a straightforward task. How long does it usually take?

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It can be reasonably straightforward, but it may take about 1-2 hours, depending on your experience. Take your time!

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1-2 hours? Are you kidding? My last job took me practically all day! Maybe I’m just too slow!

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Everyone works at their own pace! Remember, it’s all about doing the job right. It’s not a race!

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To replace the alternator in a 2012 Chevy Malibu, start by disconnecting the battery to avoid any electrical issues. Make sure to remove the negative terminal first!

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That’s a great tip, Josh! After disconnecting the battery, what’s the next step?

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After disconnecting the battery, you should remove the alternator belt. Use a ratchet to relieve tension on the belt tensioner, then slide the belt off the alternator pulley.

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Good call, Peter! Is there anything special I need to watch out for when removing the alternator itself?

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When removing the alternator, make sure to disconnect the electrical connectors and the mounting bolts. Keep track of all bolts to ensure nothing gets lost during the process.

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Exactly! Also, it’s a good idea to label any cables you disconnect to make reinstallation smoother. Did anyone else find that helpful?

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Definitely, labeling helps a ton! After removing the old alternator, just reverse the steps to install the new one—first, connect the mounting bolts, then reconnect the electrical components.

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What about reconnecting the battery? Should I do that before or after I install the belt?

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Reconnect the battery after everything is installed, including the belt. You want to ensure everything is in place before powering it up to avoid shorts or sparks.