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A failing alternator can leave a 2004-2012 Chevrolet Colorado stranded or damage electrical components over time. Replacing the alternator with a unit that matches your Colorado's electrical demands ensures reliable starts, steady charging, and consistent accessory performance under load. This guide shortlists the top alternators suitable for the 2004-2012 Colorado and explains the practical criteria used to evaluate them.The selections below reflect options that balance output capacity, electrical connector fitment, and mechanical mounting for this truck range. Read on to understand the technical specs and installation considerations that matter for a dependable alternator replacement.
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 | Parts Player 100A Alternator (12V, CW Rotation) |  |
| Best Quality Built to a higher standard if you want something more solid | ACDelco / GM Genuine Parts 25925948 Replacement Alternator |  |
| Best Value The sweet spot between price and what you get | SCITOO 12V 125A Alternator for Chevrolet Colorado / GMC Canyon / Hummer H3 (2007–2012) |  |
| Best Budget The cheapest option that still gets the job done reliably | ASTOU 125A Alternator, Direct Replacement for 2007–2012 Chevrolet Colorado and GMC Canyon (2.9L/3.7L) |  |
| Highest Rated A top-rated pick with lots of positive feedback | DB Electrical 12V 100A Alternator (400-40039) |  |
| Most Popular A crowd favorite that many people choose with confidence | SCITOO 12V 100A Replacement Alternator for 2004–2006 Chevrolet Colorado / GMC Canyon / 2006 Isuzu i-280 i-350 |  |
| Best Seller A high-volume bestseller chosen again and again | ACDelco / GM Genuine Parts Alternator (20881337) |  |
1. Parts Player 100A Alternator (12V, CW Rotation)
| Amperage | 100 A |
|---|---|
| Voltage | 12 volts |
| Rotation | CW |
| Regulator/Fan | IR/IF |
| Pulley Class | S6 |
This Parts Player alternator delivers a direct-replacement charging solution for mid-2000s Chevrolet Colorado and GMC Canyon models that use a 100A, 12V unit. It installs like a factory-style alternator and is built with a machined exterior, internal regulator and fan (IR/IF), and an S6 pulley meant to accept the stock belt setup. In real-world use it restores charging capacity for the vehicle, supports typical accessory loads and helps prevent battery drain and electrical faults caused by a failing alternator. The 100-amp output is suitable for daily driving and moderate aftermarket accessories but may limit heavy electrical upgrades. Mounting hardware is not included, so plan for a fastener check or reuse of OEM bolts during installation. For a balanced buyer wanting a cost-effective, vehicle-specific replacement, this alternator offers straightforward fitment and reliable charge output, though it is single-vehicle focused and not intended for high-output custom electrical systems.
Best for: Buyers who need a practical, factory-compatible replacement alternator to restore reliable charging on a 2004–2006 Colorado or Canyon and prioritize straightforward fitment and proven function.
Less Ideal for: Owners planning major audio, lighting, or winch upgrades who need high-output charging or those who prefer a remanufactured unit with included hardware and extended support.
- Direct-fit replacement built for Chevrolet Colorado/GMC Canyon 2004–2006 applications
- Factory-style features including internal regulator and machined housing for durability
- 100 A output adequate for stock electrical loads and everyday accessories
- Mounting hardware not included requiring reuse or purchase of bolts and fasteners
- 100 A rating may be insufficient for vehicles with heavy aftermarket electrical demands
Verdict: A straightforward, factory-style 100A replacement alternator for mid-2000s Colorado/Canyon owners who want reliable, no-nonsense charging restoration.
2. ACDelco / GM Genuine Parts 25925948 Replacement Alternator
| Brand | GM GENUINE PARTS |
|---|---|
| Model | I-Series, H3, Colorado, Canyon |
| Manufacturer Part Number | 25925948 |
This ACDelco GM Genuine Parts alternator is a newly manufactured, direct-replacement unit built to match the factory alternator’s fit and function. It supplies electrical power to the vehicle and charges the battery while the engine runs, with components tested to meet original specification requirements for durability. Typical use is a like-for-like swap when the factory alternator fails or during an electrical-system refresh; installation is straightforward for anyone doing a direct replacement on the specified GM models. Notable features include a cooling fan to help manage heat and factory-matched mounting and electrical connections to minimize fitment issues. The practical benefits are reliable charging performance and the confidence of a GM-recommended part engineered for the vehicle. Limitations are that this is a direct factory-style unit rather than a high-output performance alternator, so it will not provide additional amperage for heavy accessory loads or major audio systems without upgrading to a higher-capacity model.
Best for: Buyers who want a reliable, factory-matching replacement alternator that restores stock charging performance and fit without modification.
Less Ideal for: Drivers planning significant electrical upgrades, high-draw accessories, or competition audio systems who need an alternator with higher amperage output.
- Factory-quality direct replacement for GM vehicles to ensure correct fit and connections
- Newly manufactured components tested to meet original specification requirements
- Integrated cooling fan helps prevent overheating during normal operation
- Not designed as a high-output or performance alternator for heavy accessory or audio loads
Verdict: Choose this GM-recommended replacement if you need a dependable, factory-spec alternator that restores stock charging and fit for your Chevrolet Colorado.
3. SCITOO 12V 125A Alternator for Chevrolet Colorado / GMC Canyon / Hummer H3 (2007–2012)
| Voltage | 12 Volts |
|---|---|
| Amperage | 125 Amps |
| Rotation | CW |
| Pulley class | S6 (6 grooves) |
This SCITOO alternator is a straightforward, high-output replacement built to match factory mounting and electrical requirements for the listed Colorado-era engines. It provides 125 amps at 12 volts with a clockwise rotation, internal regulator and fan, and a six-groove pulley, so it swaps into vehicles using those specifications without aftermarket modification. Typical use is as a like-for-like replacement when your factory unit fails or cannot maintain charging under load; the CNC-machined housing and tested bearings aim to deliver reliable operation. The internal regulator and fan simplify installation by limiting external wiring and cooling requirements, and the unit is compact enough to fit OEM spaces. Expect the usual installation steps: disconnect battery, remove serpentine belt, swap the alternator and set proper belt tension. Limitations include the need to verify pulley groove count, rotation, and plug type against your vehicle before ordering, since incorrect variants will not fit or function properly, and there is no detail on included hardware or detailed plug compatibility in the listing.
Best for: Buyers wanting a practical, factory-style replacement alternator for mid-2000s Colorado/Canyon/H3 vehicles who prioritize reliable charging and an easy swap with minimal modifications.
Less Ideal for: Customers seeking a performance or high-amperage upgrade beyond stock charging capacity or those who need explicit wiring harnesses and plug adapters included.
- 125 amp output suitable for stock and mildly demanding electrical loads
- Built as a direct-replacement with matching mounting points for listed models
- Internal voltage regulator and fan reduce installation complexity
- CNC-machined housing and tested bearings for durability
- Listing does not specify electrical connector pinout or included harness adapter
- Requires confirming rotation and pulley groove count to ensure correct fit
Verdict: A no-nonsense, factory-fit 125A replacement alternator ideal for owners who want dependable charging and a straightforward swap into compatible 2007–2012 Chevrolet Colorado and related models.
4. ASTOU 125A Alternator, Direct Replacement for 2007–2012 Chevrolet Colorado and GMC Canyon (2.9L/3.7L)
| Output | 125 A at 12 V |
|---|---|
| Rotation | Clockwise (CW) |
| Regulator | Internal regulator |
| Pulley class | S6 pulley (preinstalled) |
This ASTOU 125A alternator is a direct bolt-on replacement designed to restore charging to Chevrolet Colorado and GMC Canyon 2.9L and 3.7L engines and compatible Hummer H3/H3T and Isuzu i-series where specified. It delivers 125 amps at 12 volts with a clockwise rotation, internal regulator and fan, and an S6 pulley preinstalled for straightforward installation. The unit is built with an aluminum die-cast housing and claims improved rotor and brush manufacturing that should extend service life versus basic rebuilds. Each alternator is performance tested under load before shipment, which helps ensure reliable charging and stable electrical performance after installation. For buyers focused on cost, this fills the role of a budget-conscious factory-style replacement that avoids a remanufactured core or dealer-level pricing. Expect a typical professional installation to verify wiring and belt tension; the product carries a one-year warranty and is limited to the exact fitment listed, so confirm engine size and year before buying.
Best for: Buyers replacing a failed alternator on a covered Colorado/Canyon who want a lower-cost, factory-style replacement that restores charging without paying dealer or remanufactured premiums.
Less Ideal for: Do not choose this if you need a high-output upgrade, a different pulley configuration, or a universal alternator for multiple vehicle models or years.
- 125 amps output matches factory charging needs for listed engines
- Direct bolt-on fit with preinstalled S6 pulley reduces installation prep
- Aluminum die-cast housing for improved heat dissipation
- Unit is no-load and load tested to verify performance before shipment
- Claims improved rotor and brush manufacturing for longer service life
- Fitment is limited to specific years and engine sizes so it will not suit other Colorado/Canyon model years
- Professional installation is recommended, so additional labor cost may apply
Verdict: A cost-conscious direct-replacement alternator that restores factory charging performance for covered 2007–2012 Colorado and Canyon engines without the premium of dealer or reman parts.
5. DB Electrical 12V 100A Alternator (400-40039)
| Voltage | 12V |
|---|---|
| Amperage | 100A |
| Regulator Location | Internal |
| Pulley Type | Solid |
This DB Electrical 12V 100A alternator is a direct replacement unit intended for mid-2000s compact trucks and closely matches factory charging performance. It installs in place of the original on compatible vehicles and is typically used to restore charging capacity after an alternator failure. Notable features include an internal voltage regulator and a solid pulley, which simplify installation and reduce the number of external parts to align during fitment. The unit lists multiple OEM cross-references so it can replace the factory part number without major modification. In practical use owners can expect straightforward bolt-on replacement and stable 12V output sufficient for standard electrical loads like lights, radio, and charging systems. Limitations are its 100A rating, which is adequate for stock electrical systems but may be marginal for heavily accessorized vehicles with high-current audio or added lighting. Buyers should verify part compatibility against their vehicle and wiring before purchase to avoid fitment issues.
Best for: Buyers who prioritize a dependable, factory-like replacement to restore charging performance on a mid-2000s compact truck and want a straightforward bolt-on repair.
Less Ideal for: Not the best choice for owners planning high-current aftermarket upgrades or heavy-duty electrical loads who need a higher-output alternator.
- Direct-replacement design with multiple OEM cross-reference numbers for easier fitment
- Internal voltage regulator reduces external parts and streamlines installation
- Solid pulley construction for reliable belt engagement
- Matches factory 12V, 100A output suitable for stock electrical loads
- 100A output may be insufficient for vehicles with heavy aftermarket electrical accessories
Verdict: Choose this DB Electrical 12V 100A alternator when you want a reliable, factory-equivalent replacement to restore charging on compatible mid-2000s compact trucks.
6. SCITOO 12V 100A Replacement Alternator for 2004–2006 Chevrolet Colorado / GMC Canyon / 2006 Isuzu i-280 i-350
| Voltage | 12 volts |
|---|---|
| Amperage | 100 A |
| Rotation | CW (Clockwise) |
| Regulator | IR (Internal Regulator) |
| Pulley | 6-Groove Pulley |
This SCITOO alternator supplies 12 volts at 100 amps and is built as a direct replacement for the 2004–2006 Chevrolet Colorado and GMC Canyon and the 2006 Isuzu i-280/i-350 with compatible engines. It installs in place of the factory unit and uses an internal regulator and internal cooling fan, plus a 6-groove pulley and clockwise rotation to match factory drive systems. The unit is compact and tested for durability; internal brushes, slip rings, and bearings are claimed to be quality tested for longer life and lower maintenance. For routine use it will restore charging performance, keep the battery topped during driving, and handle typical accessory loads. Limitations include single amperage output of 100A, which may be marginal for heavily modified trucks with high-power audio or additional aux loads, and fitment must be confirmed against your exact engine and trim before purchase. Expect a straightforward swap for owners replacing a failed alternator on the specified model years who need a like-for-like factory-style replacement.
Best for: Buyers who want a tested, like-for-like factory-style replacement to restore charging performance on the listed 2004–2006 Colorado/Canyon and 2006 Isuzu trucks and who prioritize reliable fit and proven user feedback.
Less Ideal for: Owners running high-demand electrical upgrades, extensive auxiliary lighting, or major audio systems should consider a higher-output or upgraded alternator solution.
- Direct-fit replacement for specified 2004–2006 Colorado/Canyon and 2006 Isuzu models, matching rotation and pulley type
- Internal regulator and fan simplify installation and reduce need for external components
- 100 A output suitable for stock electrical systems and everyday accessory use
- Quality-tested internal parts aimed at longer service life and lower maintenance
- Single 100A rating may be insufficient for vehicles with heavy aftermarket electrical loads
- Compatibility limited to specific years and engine configurations so fitment verification is required
Verdict: A ready-to-install, factory-style 12V/100A replacement that reliably restores charging on compatible 2004–2006 Colorado and Canyon trucks with standard electrical loads.
7. ACDelco / GM Genuine Parts Alternator (20881337)
| Manufacturer | ACDelco |
|---|---|
| Brand | GM GENUINE PARTS |
| Item model number | 20881337 |
| Is Discontinued By Manufacturer | Yes |
This GM Genuine Parts alternator is a newly manufactured, factory-quality replacement intended to restore charging performance to GM vehicles from the original design. It supplies power to the vehicle electrical systems and charges the battery while the engine runs, and includes the solenoid where the design requires it. Typical installation replaces a worn or failed unit and returns factory charging amperage and mounting fitment so you do not need to modify brackets or wiring when matched to the correct application. Notable features include factory validation by GM engineers, a cooling fan to help prevent overheating, and designs meant to withstand a wide range of weather conditions. Practical benefits are straightforward: reliable charging, compatibility with factory connections, and the peace of mind of a part engineered to GM standards. Limitations are that this specific part is a direct replacement for compatible GM vehicles only and must be matched to the correct vehicle application; it is not a high-output performance alternator for heavy aftermarket electrical loads.
Best for: Buyers who prioritize a direct factory-spec replacement that restores original charging performance and fit without modification.
Less Ideal for: Drivers who need a higher-output alternator for added accessories or heavy aftermarket electrical systems should look at performance-focused options.
- Built and validated to General Motors factory standards for fit and function
- Includes necessary solenoid where required for direct replacement
- Designed with a cooling fan to help manage operating temperatures
- Engineered to withstand a wide range of weather conditions
- Discontinued by manufacturer status may limit long-term availability of this exact part
Verdict: Choose this GM Genuine Parts alternator if you want a factory-validated, drop-in replacement that restores original charging reliability for your Chevrolet Colorado.
Choosing the Right 2004-2012 Chevrolet Colorado Alternator: Key Factors to Consider
Output Capacity and Amp Rating
Alternator amp rating determines how well the charging system supplies current to the battery and accessories. For the 2004-2012 Chevrolet Colorado, consider the factory charging capacity and any added electrical loads like upgraded audio systems, auxiliary lighting, or aftermarket electronics.
Choosing an alternator with insufficient amperage can cause dimming lights, slow battery charging, and electronic module issues. Conversely, oversizing the alternator without ensuring compatible pulleys and mounting can introduce belt slip or bearing stress. Verify continuous and peak amp ratings and ensure the regulator maintains stable voltage under varying engine speeds to protect the battery and sensitive electronics.
Physical Fitment and Mounting
Correct bracket alignment, ear spacing, and pulley type are essential for a bolt-in alternator swap. The 2004-2012 Colorado used several accessory-drive setups depending on engine and trim, so matching the mounting points and pulley diameter keeps belt tension and accessory alignment correct.
Mismatched mounting can require custom brackets or spacer plates, which increases installation time and potential for premature belt wear. Confirm the alternator's mounting pattern, stud locations, and whether the pulley is single-groove, multi-groove, or requires a specific serpentine alignment. Also check clearance around the alternator for heat shields and nearby components to avoid interference.
Electrical Connections and Compatibility
Plug type, stud locations, and connector pinouts affect how easily the alternator integrates with the Colorado's wiring harness. An alternator with the correct output stud position and matching plug avoids splicing or adapter use, reducing failure points.
Pay attention to regulator wire color coding and sensing wires that feed voltage feedback to the vehicle's systems. Confirm whether the unit is internally regulated or requires an external regulator connection. Proper terminal covers and corrosion-resistant contacts help maintain reliable connections in roadside and offroad conditions typical for pickup use.
Regulator and Voltage Stability
The voltage regulator keeps system voltage within a safe range to protect the battery and electronics. For the Colorado, a regulator that maintains steady voltage during idle, cruise, and heavy accessory load is crucial to avoid under- or overcharging.
Look for units with proven regulation behavior and protections against voltage spikes. Some alternators include temperature-compensated regulation to reduce overcharging risk in hot conditions. Reliable regulation reduces parasitic drain and improves battery life.
Durability and Internal Components
Quality bearings, robust rectifiers, and heavy-gauge windings extend alternator service life on a working truck like the Colorado. Bearings rated for heavy duty and sealed against contamination are especially important if the vehicle is driven in dusty or wet environments.
Assess the construction of the housing, cooling ventilation, and the robustness of internal diodes. Better internal components reduce the chance of sudden failure and make field diagnostics more straightforward. Consider whether replacement parts, such as a rebuild kit, are available if long-term maintenance is a priority.
Serviceability and Warranty
Serviceability affects repair costs and downtime. An alternator that allows straightforward bench testing, has replaceable brushes or available rebuild kits, and uses common electrical connectors simplifies maintenance for technicians and owners.
Warranty length and what it covers can indicate manufacturer confidence. Check typical warranty terms for coverage of electrical failures and core exchange policies. Understand return and core procedures before purchase to avoid surprises if a unit fails prematurely.
Understanding Alternator Output for Different Colorado Setups
The 2004-2012 Colorado was equipped with alternators that varied by engine and trim, which affects the charging output and pulley configuration. Knowing the factory output range for your specific Colorado helps you choose a replacement that matches or slightly exceeds original capacity without introducing drivetrain stress.
If you have added accessories such as winches, aftermarket lighting, or upgraded audio, plan for the additional continuous draw when selecting an alternator. A small margin above factory amperage provides headroom for future electrical upgrades while maintaining reliable battery charging.
- Estimate continuous loads from accessories and idle charging needs
- Match pulley type and diameter to avoid belt alignment issues
- Confirm physical clearance in the engine bay for larger housings
Common Alternator Symptoms on the Colorado
Recognizing early signs of a failing alternator can prevent a roadside breakdown. Typical symptoms include dimming headlights at idle, battery warning lights, recurring dead batteries, or unusual whining noises from the front accessory area.
Electrical gremlins such as flickering dashboard lights, intermittent accessory failures, or voltage irregularities when idling are often linked to alternator or regulator problems rather than the battery alone. Proper testing is required to isolate the alternator from battery and wiring issues.
- Dimming lights, especially at low rpm
- Battery warning lamp illumination during operation
- Unusual noises from alternator bearings or internal components
Bench and On-Vehicle Testing Procedures
Before replacing an alternator, perform basic on-vehicle tests: measure system voltage at idle and at higher rpm, check for voltage drop across positive and ground circuits, and inspect charging connections for corrosion. Typical healthy system voltage should be slightly above the battery resting voltage when running.
If on-vehicle testing indicates a charging fault, bench-testing the alternator with a regulated test rig can confirm output capability and regulator function. For owners or technicians without a bench tester, portable alternator testers or following procedure-based voltage checks can reliably identify failures.
- Measure voltage at battery terminals with engine off and running
- Perform voltage drop tests on charging circuit wiring
- Listen and visually inspect for loose mounts, damaged pulleys, or worn brushes
Installation Considerations and Torque Specs
Proper installation ensures long-term reliability. Tighten mounting bolts to manufacturer torque specs and ensure the accessory belt has correct tension after replacing the alternator. Incorrect torque or tension can accelerate bearing wear or cause belt slip.
Route and secure wiring to prevent chafing and exposure to heat sources. Reuse terminal covers where provided and treat exposed connections with dielectric grease to reduce corrosion. If the replacement alternator uses a different pulley type, confirm belt routing and tensioner compatibility before finalizing the installation.
- Follow torque specs for mounting bolts and pulley fasteners
- Check belt alignment after installation
- Secure wiring harness and protect connector terminals
When to Consider a Rebuild Vs Full Replacement
Rebuilding an alternator can be cost-effective when the housing and rotor are sound but brushes, diodes, or bearings have failed. For an older Colorado with otherwise good engine and accessory condition, a rebuild kit that matches the original specifications may restore full functionality.
However, if the alternator shows signs of severe rotor or stator damage, or if the cost and downtime of sourcing parts is high, a complete replacement might be preferable. Consider availability of rebuild kits and local technical expertise when weighing options.
- Inspect for rotor/stator damage before committing to a rebuild
- Verify availability of compatible rebuild kit components
- Factor labor time and testing equipment into rebuild decisions
Maintaining Charging System Health Over Time
Routine inspections help extend alternator life. Check belt condition regularly, clean terminals and ensure connectors are tight, and watch for early electrical symptoms. Keep the charging system free of oil and coolant contamination which can degrade bearings and electrical contacts.
Address related systems such as the battery and ground straps, because poor grounding or a weak battery increases alternator load and can accelerate wear. Periodic voltage checks during routine service catch developing issues before they progress to failure.
- Inspect belts and tensioners at scheduled maintenance intervals
- Clean battery terminals and check ground strap condition
- Run voltage checks after installing significant electrical accessories
Still looking for the perfect fit?
Select your Chevrolet Colorado configuration to see the most relevant Alternators recommendations
How We Chose the Best 2004-2012 Chevrolet Colorado Alternator
We prioritized alternators that meet or exceed original equipment output and durability for the 2004-2012 Chevrolet Colorado. Primary evaluation criteria included electrical output and voltage regulation to ensure consistent charging under typical load profiles for this truck. We also examined physical fitment factors such as mounting ear alignment, pulley type, and connector compatibility so the unit installs without bracket modification or wiring splicing. Build quality and internal component choices, like bearing type and diode/rectifier robustness, were weighted to reflect long-term reliability.Electrical testing and performance under real-world accessory loads were considered through available manufacturer specifications and documented testing procedures. We favored units offering clear warranty coverage and straightforward replacement parts, while deprioritizing options with unclear spec sheets or ambiguous fitment claims. Units that required major vehicle modifications or custom fabrication were excluded. Finally, we considered serviceability, such as availability of rebuild kits and ease of bench testing, to help owners and technicians make a practical choice for the Colorado.
Our full evaluation process is outlined in our review methodology.
FAQ
How do I know if the alternator is failing or if the battery is the problem?
Start with basic voltage checks: a healthy charging system shows slightly higher voltage with the engine running than the resting battery voltage. If voltage drops under load or the battery light is on while driving, the alternator or regulator is often at fault. Also check for corroded connections and perform a load test to isolate the component.
Can I install a higher-amperage alternator on my Colorado?
You can fit a higher-amperage unit if the physical mounting, pulley alignment, and belt capacity are compatible. Ensure the electrical connectors and regulator behavior suit the vehicle, and avoid oversized pulleys that change accessory speed or cause belt slip.
Are rebuild kits a reliable option for older Colorado alternators?
Rebuild kits can be reliable if the alternator housing and rotor are undamaged and the replacement parts match factory specs. Availability of quality components and competent bench testing are important factors to ensure a successful rebuild.
What are common maintenance steps to extend alternator life?
Keep belts properly tensioned, clean and tighten electrical connections, and prevent oil or coolant contamination. Also maintain a healthy battery and solid grounds to reduce excess stress on the charging system.
Will a failing alternator cause warning lights or drivability issues?
Yes. A failing alternator often triggers the battery or charging system warning light and can cause dimming lights, intermittent accessory failures, and even stalling if the battery is drained while driving.
How long should a replacement alternator last on a Colorado?
Service life varies with driving conditions and maintenance but many alternators last multiple years of normal use. Harsh environments, heavy electrical loads, or neglected belts and connections tend to shorten life expectancy.
Final Verdict
When replacing the alternator on a 2004-2012 Chevrolet Colorado, prioritize correct amp capacity, mounting fitment, and connector compatibility to ensure reliable charging and trouble-free installation. Consider the vehicle's accessory load and whether a modest amp increase is warranted, but avoid mismatched pulleys or bracket modifications that can cause mechanical issues.Balance durability and serviceability when deciding between rebuilds and full replacements. Address related items such as belts, grounds, and battery condition at the same time to maximize the longevity of the new unit and maintain dependable electrical performance for the Colorado.
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- Check out all Chevrolet Colorado parts & accessories
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