High Output Alternator for Pontiac G5 (2008-2010) 2.2L
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High-Output 250A Alternator for 2008-2010 Pontiac G5 (GM Delta)
What it Does: The 250 Amp High Output Alternator replaces the underpowered factory charging unit on the 2008-2010 Pontiac G5 to eliminate system voltage drop and supply stable current to high-draw electrical accessories.
The Stock Pontiac G5 Charging Limitations
The factory charging system on the GM Delta platform utilizes a low-output alternator rated at approximately 105 to 120 amps. Under heavy continuous electrical demand—such as high-wattage sound systems, auxiliary lighting, or performance cooling fans—the OEM diode bridge experiences thermal fatigue, causing line voltage to sag below 12.8 volts. This continuous thermal strain and rotor saturation degrade the internal windings, leading to premature diode burnout and sluggish electronic throttle response.
The Engineering Solution
Engineered as a direct bolt-in replacement, this high-output unit supplies a robust 250 amps of continuous power. Featuring heavy-gauge copper windings, premium avalanche diode rectifiers, and high-temp insulated stators, this assembly maintains consistent 14.4V rail voltage even under severe heat soak. The precision-machined housing fits directly to the factory bracketry, restoring electrical stability across the entire rev range of the 2.2L Ecotec engine.
What's Included
- 1 x 250 Amp High Output Alternator
Technical Specifications
| Fitment | 2008-2010 Pontiac G5 |
|---|---|
| Engine / Chassis | 2.2L Ecotec (L61/LAP) / GM Delta |
| Stock Output | 148-155 hp / 150-152 lb-ft |
| Replaces OEM Part # | 20758751, 22762984, 11164N, 11164R, 11265, 11265n, FG12S010, GMT319, GMX001, GMX384, GMX386, 420532, 2650532, 15828450, 11164 |
Compatibility
- 2008 Pontiac G5 Base / SE (2.2L L4)
- 2009 Pontiac G5 Base (2.2L L4)
- 2010 Pontiac G5 Base (2.2L L4)
Frequently Asked Questions & Fitment Warnings
Does this fit the GM Delta G5?
Yes, this is a direct fit for the 2008-2010 Pontiac G5 equipped with the 2.2L Ecotec engine. It matches OEM interchange numbers including 20758751 and 22762984.
Do I need to upgrade my main power wiring for a 250A alternator?
Yes, executing a "Big 3" wiring upgrade with minimum 4-gauge or 0-gauge power and ground cables is required to safely support 250 amps without melting factory wiring.
The Pontiac Sport Compact Standard
Built to handle rigorous real-world driving and aggressive electrical modifications, this alternator delivers dependable amperage without sacrificing OEM mounting precision.
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