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If your 2015-2022 Chevrolet Colorado is showing electrical glitches or slow cranking, the alternator is a common source of trouble. Picking the right alternator matters because the Colorado depends on steady charging to run electronics, maintain battery health, and support towing or accessory loads.This guide covers the six best alternators shortlisted for the Colorado years in scope and explains the practical criteria used to evaluate them. You will get clarity on output ratings, build quality, fitment considerations, and installation factors to help you choose the correct replacement for your driving needs.
Looking for other parts? See all Chevrolet Colorado parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | GM Genuine Parts 13597236 Alternator |  |
| Best Quality Built to a higher standard if you want something more solid | Marketplace Auto Parts 150 Amp Alternator for 2017–2022 Chevy Colorado 3.6L V6 (VIN N) |  |
| Best Value The sweet spot between price and what you get | SCITOO 150A Replacement Alternator for Chevrolet Camaro/Colorado and GMC Canyon 3.6L V6 |  |
| Best Budget The cheapest option that still gets the job done reliably | partszen 12V 150A Replacement Alternator (5-Groove) |  |
| Highest Rated A top-rated pick with lots of positive feedback | SHICHU CFA21 Replacement Alternator, 150 Amp, 12V |  |
| Most Popular A crowd favorite that many people choose with confidence | SINTLY Alternator 14V 150A with 5-Groove Pulley (11682N) |  |
1. GM Genuine Parts 13597236 Alternator
| Manufacturer | ACDelco |
|---|---|
| Brand | GM GENUINE PARTS |
| Model | Alternator |
| Item model number | 13597236 |
This GM Genuine Parts alternator is a newly manufactured, factory-quality replacement built to the same specifications as the original unit. It supplies electrical power to the vehicle and charges the battery while the engine runs, and is intended as a drop-in replacement for compatible GM vehicles. Notable features include components tested to meet original specification requirements, corrosion-resistant construction for durability, and included solenoid for a complete swap. In real-world use it provides stable charging for modern electrical loads and is designed to support start/stop systems and heavy accessory demand. The primary benefits are reliable fitment, predictable performance, and the peace of mind that comes with a GM-recommended replacement. Limitations are typical of exact-fit factory replacements: amperage output must match your vehicle�s requirements so confirm the correct part number, and this unit is focused on replacement rather than upgraded high-output performance for heavily modified electrical systems.
Best for: Buyers who want a reliable, factory-quality replacement that restores original charging performance and minimizes fitment headaches for routine repair.
Less Ideal for: Those seeking a high-output upgrade for added accessory or aftermarket audio power should consider performance-focused alternators instead.
- Newly manufactured to GM original-equipment specifications for consistent fit and function
- Tested components and corrosion resistance for long-term durability
- Includes solenoid so installation is closer to plug-and-play
- Designed to handle modern electrical loads and start/stop systems
- Not a high-output performance alternator for heavily modified vehicles
Verdict: Choose this GM Genuine Parts alternator when you want a direct, factory-quality replacement that restores original charging reliability for your Chevy Colorado.
2. Marketplace Auto Parts 150 Amp Alternator for 2017–2022 Chevy Colorado 3.6L V6 (VIN N)
| Output | 150 Amp |
|---|---|
| Fit Type | Vehicle Specific Fit |
| Compatible Engine | 3.6L V6 LGZ (VIN N) |
| Warranty | 1 Year Warranty |
This 150 amp alternator from Marketplace Auto Parts is a direct-fit replacement for the 3.6L V6 LGZ (VIN N) used in 2017–2022 Chevy Colorado models. It installs in place of the factory unit and supplies up to 150 amps of charging capacity, which is useful for restoring charging performance after a failed alternator or when replacing an aging unit. The product is marketed as vehicle specific fit, so bolt locations and electrical connectors match factory placements for the listed wheelbases and trim levels. For drivers who run stock electrical loads it restores factory charging behavior; for users with mild accessory upgrades the 150 amp output gives a bit more headroom versus lower-output units. Practical limits are that it is designed only for the specified engine and VIN configuration and does not change engine performance beyond charging capacity; heavier electrical builds or large audio systems may require a higher-capacity aftermarket unit. The unit comes with a one year warranty and is sold as a single alternator ready for installation by a DIYer or pro mechanic.
Best for: Drivers who want a ready-to-install replacement that restores reliable charging for 2017–2022 Chevy Colorado 3.6L V6 vehicles and who prioritize a vehicle-specific, OEM-style fit.
Less Ideal for: Owners planning major electrical upgrades, high-power audio systems, or setups that need more than 150 amps should consider higher-capacity or purpose-built performance alternators.
- 150 amp output provides solid charging capacity for stock and modestly upgraded electrical systems
- Vehicle-specific fit for 2017–2022 Chevy Colorado 3.6L V6 LGZ with VIN N reduces install modifications
- Includes factory-style connectors and mounting locations for straightforward replacement
- Backed by a one year manufacturer warranty
- Compatible only with the LGZ 3.6L V6 VIN N configurations and specified wheelbases
- May not supply enough current for high-demand custom audio or heavy accessory installs
Verdict: Choose this 150 amp, vehicle-specific alternator when you need a plug-and-play replacement that restores strong charging performance for 2017–2022 Chevy Colorado 3.6L V6 LGZ vehicles.
3. SCITOO 150A Replacement Alternator for Chevrolet Camaro/Colorado and GMC Canyon 3.6L V6
| Amperage | 150 A |
|---|---|
| Voltage | 12 volts |
| Rotation | CW (Clockwise) |
| Pulley | 6-Groove Decoupler Pulley |
| Regulator | Internal (IR) |
This SCITOO alternator is a 150 A, 12 V replacement built for the 3.6L V6 used in certain Camaro, Colorado and Canyon models. It is intended to swap in for a failed factory unit and restore charging performance for the vehicle electrical system. The unit uses a clockwise rotation, a 6-groove decoupler pulley and an internal regulator and fan configuration that match the listed applications, and the seller emphasizes thicker copper windings for stronger output and steadier voltage under load. For everyday driving it should reliably power lights, infotainment and charging needs and handle typical accessory loads. Installation requires standard alternator replacement steps including battery disconnection and belt tension adjustment. Limitations include that fitment is specific to the stated years and V6 engine and you should confirm pulley and connector style against your original part; professional installation is recommended if you are not experienced with charging systems.
Best for: Drivers who want a direct aftermarket replacement to restore reliable charging on a 3.6L V6 Colorado or similar vehicle and who prioritize a practical, no-frills repair that matches factory replacement form and function.
Less Ideal for: Buyers seeking a plug-and-play upgrade for other engines, broader year coverage, or an alternator with significantly higher aftermarket output for heavy-duty electrical modifications.
- 150 amp output suitable for higher accessory loads and restored charging capacity
- 12V unit with matching rotation, regulator and pulley style for listed 3.6L V6 applications
- Built with thicker copper windings claimed to give steadier voltage under load
- Includes a 6-groove decoupler pulley which simplifies direct replacement where that pulley is required
- Fitment limited to specific 3.6L V6 model years so it is not a universal replacement
- May require verification of connector and mounting details before purchase to ensure exact match
Verdict: A practical 150 A replacement that restores factory-level charging for 3.6L V6 Colorado/Canyon owners who need a dependable, direct-fit alternator.
4. partszen 12V 150A Replacement Alternator (5-Groove)
| Voltage | 12V |
|---|---|
| Maximum output | 150A |
| Pulley | 5 Grooves |
| Fitment note | Except start/stop feature |
This partszen alternator is a straightforward replacement unit that supplies 12 volts at up to 150 amps and uses a 5-groove pulley for belt compatibility. It is intended as a direct-fit swap for a range of 2.0L and 2.5L GM engines, commonly used in vehicles like the 2015–2022 Chevrolet Colorado with the 2.5L engine. Installation follows the usual alternator swap steps and will restore charging performance when a factory alternator fails. Notable features include a regulator interface claimed to be more durable and a design that mirrors factory mounting and electrical connections, which simplifies installation for DIYers or independent shops. Practical benefits are higher charging capacity than some low-output replacements and a parts-focused fitment list that reduces the guesswork on compatibility. Limitations are that it is not compatible with vehicles equipped with start/stop systems and you should verify pulley groove count and connector type before purchasing to avoid returns.
Best for: Buyers looking to replace a failed alternator on a budget who prioritize a direct-fit unit that restores factory charging performance without extra modifications.
Less Ideal for: Those who need an alternator for vehicles with start/stop systems or who require higher-output performance or upgraded features for heavy accessory use.
- Direct-fit replacement for many 2.0L and 2.5L GM engines without start/stop
- 150A output provides solid charging capacity for common electrical loads
- Uses a 5-groove pulley matching standard belt setups to ease installation
- Durable regulator interface and factory-style mounting reduce modification needs
- Not compatible with vehicles that have start/stop systems
Verdict: A budget-focused, direct-fit 150A alternator for 2.0L and 2.5L GM trucks that restores reliable charging without extra work.
5. SHICHU CFA21 Replacement Alternator, 150 Amp, 12V
| Amperage Rating | 150 Amp |
|---|---|
| Voltage | 12.0 Volt |
| Rotation Direction | Clockwise |
| Pulley Groove Quantity | 5 |
This SHICHU CFA21 alternator is a straightforward replacement unit built to restore the charging system on compatible Chevrolet Colorado and similar GM 2.0–2.5L four-cylinder vehicles. It delivers a 150 amp output at 12 volts with a clockwise rotation and a five-groove pulley, so it supplies ample charging capacity for typical accessories and battery charging in daily driving. Installation is the same as a factory-style alternator: swap the old unit, reconnect the electrical plug and belt, and torque the mounting bolts to spec. The chrome exterior and compact package make it easy to handle during installation. The product comes with a one-year unlimited-mileage quality guarantee backed by seller support. Limitations to be aware of are that fitment depends on exact part number cross-reference rather than vehicle year alone and the listing does not include extensive bench-test data or OE branding, so buyers should verify connector and pulley specifications before ordering.
Best for: A buyer who needs a reliable, high-output replacement alternator to restore charging performance on a mid-2010s Chevrolet Colorado and prefers a direct-fit unit with seller support.
Less Ideal for: Anyone who wants a branded OEM unit with verified factory test reports or who is unsure about pulley/connector compatibility without checking part cross-references.
- 150 amp output provides strong charging capacity for modern electrical loads
- Factory-style design with clockwise rotation and five-groove pulley for straightforward swap-in
- Compact, chrome-finished housing that is easy to handle during installation
- Includes a one-year unlimited-mileage quality guarantee with seller support
- Fitment requires confirming the exact replacement part number and connector match
- No manufacturer bench-test data or OEM branding provided in the listing
Verdict: If you need a high-output, direct-replacement alternator to reliably restore charging on a compatible Colorado, this 150A SHICHU unit is a practical, install-friendly choice backed by a one-year guarantee.
6. SINTLY Alternator 14V 150A with 5-Groove Pulley (11682N)
| Voltage | 14V |
|---|---|
| Amperage | 150A |
| Rotation | CW |
| Number of Grooves | 5-Groove Pulley |
This SINTLY alternator is a direct-replacement unit designed to restore charging performance on compatible GM 4-cylinder vehicles. It delivers 14 volts and 150 amps with clockwise rotation and a 5-groove pulley, so it can handle modern electrical loads like infotainment systems and charging devices. Typical installation replaces a worn factory alternator; the machined exterior and OEM-style mounting points aim to simplify bolt-in fitment for the listed models. Benefits include a high continuous amperage rating that helps prevent battery drain under heavy accessory use and a durable construction intended for long service life. Buyers should note this is a vehicle-specific replacement, so correct fitment must be confirmed against the OEM part numbers; it does not include adaptors for vehicles with different pulley or electrical connectors. For a purchaser focused on reliable charging and straightforward replacement, this unit provides a strong factory-style option with a high amperage output.
Best for: Buyers who want a high-output, factory-style replacement alternator for routine repairs on supported GM 4-cylinder models and who prioritize demonstrated owner satisfaction and reliability.
Less Ideal for: Drivers seeking a universal alternator or custom pulley/electrical modifications should look for purpose-built or adjustable options instead.
- 150A output supports modern electrical accessories and reduces risk of battery drain
- Direct-fit design references multiple OEM part numbers for easier replacement
- Machined exterior and factory-style mounting points for straightforward installation
- CW rotation and 5-groove pulley match many GM 4-cylinder pulley systems
- Fitment is vehicle- and spec-specific and may require checking OEM part numbers before purchase
- No mention of included wiring adapters or plug compatibility for nonstandard harnesses
Verdict: A high-output, vehicle-specific replacement alternator that restores reliable charging for compatible GM 4-cylinder trucks and cars.
Choosing the Right 2015-2022 Chevrolet Colorado Alternator: Key Factors to Consider
Output Capacity and Amperage Rating
Matching the alternator output to your Colorado's electrical demands is the single most important factor. Stock alternators are factory-rated for the vehicle's typical load, but if you run accessories such as upgraded audio, lighting, winches, or frequently tow, you may need a higher-amperage unit to prevent battery drain.
An undersized alternator will lead to a discharged battery, dimming lights under load, and voltage fluctuation that can stress electronics. Confirm continuous and peak amperage ratings and compare them to the combined draw of your accessories. Also evaluate how the alternator performs at idle, since towing or city driving often keeps RPMs low and small differences in low-RPM output can be significant.
Mechanical Fitment and Mounting
Proper mechanical fit ensures the alternator installs securely and aligns with the Colorado's belt path. Differences in mounting ear locations, bracket height, or pulley offset can block installation or cause belt misalignment, which leads to premature belt wear and noise.
Check that the replacement matches the original mounting pattern, pulley type, and serpentine routing for the 2015-2022 Colorado. If your truck has an accessory package, auxiliary brackets, or a different engine option within the model years covered, confirm the unit's compatibility with those configurations before purchase.
Pulley Type and Drive Compatibility
Pulley type—one-way clutch, standard, or specific diameter—affects belt tension, NVH, and accessory drive behavior. The wrong pulley can create belt squeal, reduce accessory life, or place extra strain on the alternator bearings.
Verify the pulley style and number of grooves to match your Colorado's belt system. If upgrading to a higher-output alternator, ensure the pulley and drive speed provide the expected amperage across the engine RPM range and do not interfere with other accessories.
Electrical Connections and Regulator Design
Connector style, terminal locations, and the onboard voltage regulator determine how straightforward the swap will be and how stable charging remains under load. A direct-fit connector reduces wiring work and the risk of loose connections that cause intermittent charging.
Integrated regulators vary in quality; look for units with solid terminal construction and well-protected regulator housings. Consider whether the vehicle's electrical system relies on an external sense wire or internal regulator and confirm the replacement supports the necessary wiring configuration.
Durability and Cooling
Alternators generate heat and are exposed to road contaminants; rugged construction and effective cooling paths extend service life. Heat is a primary cause of diode and regulator failure, so units with improved ventilation or heavy-duty internal components typically last longer in truck duty cycles.
Assess housing materials, protective coatings, and whether the design isolates bearings from road grime. For trucks used in towing, off-road, or climates with large temperature swings, prioritize alternators with proven thermal performance and corrosion resistance.
Serviceability and Parts Availability
Consider how accessible wear items and replaceable components are if you plan to repair rather than replace the entire unit. Brush assemblies, bearings, and diodes are common service points, and having an available rebuild kit or replacement part can save money and downtime.
Also check the availability of technical documentation such as wiring diagrams and torque specs. If you intend to perform the installation yourself, units designed for easier disassembly and with clear terminal labeling will reduce installation time and the chance of wiring errors.
Understanding Alternator Load on the Colorado
Knowing how an alternator supports the Colorado's electrical system helps you pick the correct rating. The alternator must supply enough current to run ignition systems, engine management, lighting, infotainment, and any aftermarket accessories while simultaneously keeping the battery charged.
- Estimate combined accessory draw including headlights, heated seats, audio, auxiliary lighting, and trailer connectors.
- Consider idle and low-RPM scenarios where alternator output drops and battery support becomes critical.
- If you tow frequently, factor in trailer lighting and potential electric brake controllers into the load calculation.
Common Alternator Symptoms and Diagnosis
Recognizing alternator symptoms early prevents a dead battery and roadside failures. Typical signs include dimming or flickering lights, a battery warning lamp, slow engine crank, or unusual whining noises from the accessory area.
- Check for dashboard warning lights and measure system voltage with a multimeter at idle and during a rev to see charging behavior.
- Listen for bearing noise or whining that changes with engine speed which often indicates internal wear.
- Inspect wiring and connectors for corrosion or loose terminals before replacing the unit; sometimes the alternator is fine but connections are the problem.
Installation Considerations for DIYers
Replacing an alternator on the 2015-2022 Colorado is mechanically straightforward for someone with basic tools, but there are important steps to follow to avoid electrical damage. Always disconnect the battery negative terminal before removing the old alternator and note belt routing and tensioning procedure.
- Label connectors and take photos to ensure correct reassembly.
- Use a torque wrench on mounting fasteners to the factory specifications and inspect tensioner and belt condition; replace the belt if it shows wear.
- After installation, verify charging voltage at the battery with the engine running and test under accessory load.
When to Choose a Higher Output Unit
Opt for a higher-output alternator if you have added electrical accessories or expect heavy towing duty. A higher-capacity alternator helps maintain voltage stability and prevents rapid battery discharge under sustained loads.
- Calculate typical and peak current draw to select an alternator with a comfortable margin above your needs.
- Ensure the alternator's physical and pulley compatibility with the Colorado before upgrading.
- Balance the benefits of higher output with greater weight and potential additional heat generation.
Maintenance Tips to Extend Alternator Life
Regular maintenance reduces alternator failures and extends service life. Periodically inspect belt tension and condition, clean electrical connections, and listen for abnormal noises during routine service.
- Keep the cooling fins and housing clear of heavy debris when possible.
- Address battery issues promptly; a weak battery forces the alternator to work harder and shortens its life.
- Avoid jump-starting practices that can create voltage spikes; use proper procedures to protect sensitive electronics.
Still looking for the perfect fit?
Select your Chevrolet Colorado configuration to see the most relevant Alternators recommendations
How We Chose the Best 2015-2022 Chevrolet Colorado Alternator
We evaluated alternators for the 2015-2022 Chevrolet Colorado using vehicle-specific performance and reliability filters to build a shortlist. Primary criteria included electrical output and amperage ratings to match factory and accessory loads, mechanical fit and mounting compatibility with Colorado engines and accessory layouts, internal component quality such as bearing and diode construction, and expected longevity under typical driving and towing conditions.We also prioritized units with robust cooling designs and corrosion-resistant housings for trucks that see variable climates and work use. Ease of installation and availability of full-fit replacement plug-and-play connectors was considered to reduce installation errors. Finally, we reviewed documented serviceability aspects such as brush and regulator accessibility and the availability of rebuild kits where applicable.Excluded from consideration were generic, one-size-fits-all units without vehicle-specific fitment, alternators with unclear amperage ratings, or products lacking basic specification documentation. The final picks balanced electrical capacity, build robustness, and real-world installation practicality for Colorado owners.
Our full evaluation process is outlined in our review methodology.
FAQ
What are the most common signs of a failing alternator on a Colorado?
Common signs include dashboard charging warnings, dim or flickering lights, slow engine cranking, and unusual whining or grinding noises from the accessory area. These symptoms often appear gradually as internal components wear.
Can I test the alternator myself before replacing it?
Yes. Use a multimeter to measure battery voltage at idle and during a moderate rev; charging voltage should generally be above battery resting voltage and stable under load. Load tests and checking for AC ripple can also help identify diode or regulator issues.
Will a higher-amperage alternator damage my Colorado's electrical system?
Not if the alternator is mechanically and electrically compatible. You must match pulley speed and regulator wiring and ensure the alternator fits the mounting and belt system. Properly configured, a higher-amperage unit supplies additional current without harm.
Is it worth rebuilding an alternator instead of replacing it?
Rebuilding can be cost-effective if the housing and shaft are in good condition and replacement parts like brushes, bearings, and diodes are available. However, rebuilding requires skill and the right parts; evaluate serviceability and part availability first.
How long should a replacement alternator last on a Chevrolet Colorado?
Lifespan varies with usage and environment, but a properly matched alternator with good cooling and clean electrical connections typically lasts many years. Heavy towing, frequent short trips, and exposure to contaminants can shorten service life.
Do I need any special tools to replace the alternator on these model years?
Most installations require common hand tools, a socket set, torque wrench, and possibly a serpentine belt tool for tensioning. A multimeter is helpful for post-installation testing. No specialized factory-only tools are usually required.
Final Verdict
Prioritize matching amperage output and ensuring mechanical fit when selecting an alternator for a 2015-2022 Chevrolet Colorado. Consider how you use the truck—towing, added lighting, or audio upgrades increase electrical demand and justify higher-capacity units. Balance higher output against installation compatibility, cooling ability, and serviceability.By focusing on rated output, mounting and pulley compatibility, regulator and connector design, and durability under truck duty, you can select a unit that restores reliable charging and reduces the chance of roadside failures. Choose the option that best aligns with your accessory load and installation preferences for confident, long-term performance.
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- Check out all Chevrolet Colorado parts & accessories
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