From the brand
Product description
Proper 120 Amp Output — Exactly What GM Designed
GM engineered these platforms around a 120-amp charging system to balance electrical demand and reliability. This alternator delivers:
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Stable voltage at idle and highway speeds
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Proper battery recharge after cold starts
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Consistent output with accessories running
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Reduced strain on wiring and electrical components
Not underpowered. Not excessive. Just right.
Built for OE Fitment and Long-Term Reliability
This A-Premium alternator features:
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High-efficiency copper windings
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Internal voltage regulator for consistent output
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Precision-balanced internals for smooth operation
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OE-style mounting points and electrical connectors
The 6-groove pulley ensures correct belt tracking, quiet operation, and long belt life — because belt squeal is not a feature.
Compatible with Buick Models:
- 2006-2006 Allure V6 3.6L
- 2006-2009 Allure V6 3.8L
- 2006-2006 LaCrosse V6 3.6L
- 2006-2009 LaCrosse V6 3.8L
Compatible with Pontiac Models:
- 2006-2008 Grand Prix V6 3.8L
OEM Number:
- 11127N, 11127, 10366269, 0124425064, 0124425088
Specifications:
- Amperage: 120A
- Voltage: 12V
- Rotation: Clockwise
- Number of Grooves: 6-Groove Pulley
- Fan Design Type: Internal
- Regulator Design Type: Internal
Why Alternator Health Matters on GM V6 Platforms
Once the engine is running, the alternator becomes the main power source for:
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Engine control modules and ignition
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Fuel system and sensors
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Electric power steering
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Headlights and exterior lighting
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HVAC, infotainment, and accessories
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Charging and maintaining the battery
When alternator output drops, the battery is forced to carry the load — briefly — and then fails early. That leads to:
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Repeated dead batteries
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Flickering or dim headlights
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Charging system warning lights
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Electrical glitches and poor drivability
Replacing the alternator fixes the root cause, not just the symptom.
Why Buy from Pro Street Online?
At Pro Street Online, we sell parts that actually fix problems. This alternator is:
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Vehicle-specific
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Correctly rated for GM 3.6L & 3.8L platforms
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Designed to restore factory charging reliability
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Ideal for daily drivers and long-term ownership
If your Buick or Pontiac still runs strong, this alternator keeps the electrical system behaving.
Gail Bergstrom –
Our mechanic recommend this alternator