A Guide to Replacing the Alternator on Your 2007-2013 Chevrolet Avalanche
Keep your truck's electrical system healthy by understanding alternator failure and choosing the right replacement part.
- Alternator failure symptoms include dim lights, dashboard warnings, slow starting, and strange noises from the engine.
- Replacement is a DIY-friendly job for this truck, taking about 1-2 hours with basic tools.
- Choose an alternator with the correct amperage (usually 145A or 160A) for your truck's factory setup.
- For OEM-like quality, choose ACDelco or Bosch; for heavy electrical loads, consider a high-output brand like Powermaster.
Signs of a Failing Alternator
When your Avalanche's alternator starts to fail, it will give you several warning signs. Ignoring them can leave you with a dead battery and a truck that won't start. Be aware of these common symptoms:
- Warning Lights: A battery icon or a "Check Engine" light on your dashboard is often the first sign of a problem. Some models may display a "Service Charging System" or "Battery Not Charging" message.
- Dim or Flickering Lights: Headlights and interior lights that are dimmer than usual, or that flicker and change brightness, are a classic symptom of a weak alternator.
- Slow or Malfunctioning Accessories: You might notice your power windows moving slowly, the radio cutting out, or the air conditioning acting up. The alternator powers these components, and when it fails, it can't keep up with the demand.
- Difficulty Starting: If the engine cranks slowly or you hear a clicking noise when you turn the key, the battery may not have enough charge, which could be the alternator's fault. 🎬 See how to test your alternator quickly and simply.
- Unusual Noises: A whining, grinding, or squealing sound from under the hood can indicate that the bearings inside the alternator are worn out or the pulley is failing.
Choosing the Right Aftermarket Alternator
When replacing the alternator on your Avalanche, you have several options. While an OEM part from the dealer is available, new aftermarket parts offer comparable quality at a better price. The key is to choose a reputable brand. Aftermarket alternators for the Avalanche are available in different amperage ratings, most commonly 145 amp and 160 amp, to match the original factory specifications.
Aftermarket Brand Tiers
| Tier | Brands | Notes |
|---|---|---|
| Premium Aftermarket | ACDelco, Bosch, Remy | ACDelco is the original GM parts supplier and offers a direct fit and reliable performance. Bosch is a well-respected brand known for building high-quality parts that meet or exceed OEM standards. Remy is another established brand, though some users report mixed long-term reliability with newer units. |
| High-Performance / Specialty | Powermaster | If you run a lot of electrical accessories like a powerful stereo system, off-road lights, or a winch, a high-output alternator from a brand like Powermaster is a great upgrade. They offer units with significantly higher amperage (e.g., 220-245 amps) to handle the extra load. |
| Standard / Economy | WAI Global, BBB Industries, MPA | These brands provide a cost-effective solution for a standard replacement. While they are manufactured to fit and function like the original, some user reviews suggest that long-term durability can be inconsistent compared to premium brands. They are a viable option if budget is the primary concern. |
Check Your Amperage
The 2007-2013 Avalanche came with different alternator options, typically 145 or 160 amps. Always check the specifications of your original part or consult your owner's manual to ensure you purchase a replacement with the correct amperage for your truck's needs.
Known Issues, Recalls, and Service Bulletins
Currently, there are no major recalls or widespread Technical Service Bulletins (TSBs) specifically for alternator failure on the 2007-2013 Chevrolet Avalanche. Most failures are due to normal wear and tear over time and mileage. However, some owners have reported premature failure of replacement alternators, which can sometimes be linked to poor quality remanufactured units or underlying issues in the vehicle's electrical system.
Consider Replacing the Belt and Tensioner
While you are replacing the alternator, it's a good time to inspect the serpentine belt and the belt tensioner. A worn belt or a weak tensioner can cause the new alternator to perform poorly or fail prematurely. Replacing them at the same time can save you from doing the job twice.
Frequently Asked Questions (FAQ)
How much does it cost to replace a Chevy Avalanche alternator?
The total cost for a professional replacement ranges from approximately $389 to $762. This includes labor costs, which are typically between $73 and $107, and the part itself, which can range from about $57 to over $342 depending on the brand and quality.
Can I install the alternator myself?
Yes, for a moderately experienced DIY mechanic, this is a manageable job. The alternator is located at the top front of the engine and is relatively easy to access. The process involves disconnecting the battery, removing the serpentine belt, disconnecting two electrical connectors, and removing two mounting bolts. The entire job can typically be done in about 1 to 2 hours.
🎬 Follow this step-by-step walkthrough to replace the alternator yourself.Do I need a high-output alternator?
For a stock truck, the standard 145 or 160 amp alternator is sufficient. However, if you have added high-draw accessories like a large sound system, a snow plow, a winch, or extensive auxiliary lighting, upgrading to a high-output alternator (200+ amps) is highly recommended to prevent electrical issues.
What's the difference between a new and a remanufactured alternator?
A new alternator is built with all-new components. A remanufactured alternator has been disassembled, cleaned, and had its wearable parts (like bearings and brushes) replaced before being reassembled and tested. While premium remanufactured units from brands like Bosch or ACDelco can be reliable, new units generally offer better peace of mind and often have fewer early failures.
Helpful Videos
Technical Specifications
OEM Part Numbers: 20881337
Standard amperage ratings for the 2007-2013 Chevrolet Avalanche are 145 amps and 160 amps. The alternator uses a 6-groove serpentine pulley and has an internal voltage regulator. High-output aftermarket options are available from 200 amps up to 370 amps.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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