High Output Alternator for Chevrolet Impala (2006-2011) 3.5L 3.9L
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High-Output 250-Amp Alternator for 2006-2011 Chevrolet Impala (W-Body)
What it Does: The 250-amp high-output alternator replaces the low-output factory charging unit on the 2006-2011 Chevrolet Impala to stabilize system voltage, eliminate idle electrical droop, and support high-draw electrical accessories.
The Stock Chevrolet Impala Charging Limitations
Factory W-Body charging systems were engineered for stock electronics, utilizing an OEM alternator rated between 125 to 150 amps. When subjected to aftermarket audio installations, auxiliary lighting, or commercial gear, the stock unit suffers from acute thermal saturation. Elevated engine bay temperatures in the transverse V6 layout cause factory diode pack breakdown, causing voltage decay below 12.6V at curb idle, excessive ripple current, and parasitic battery drain that accelerates lead-acid sulfation.
The Engineering Solution
Manufactured in the USA, this heavy-duty 250-amp alternator features precision copper hairpin stator windings and an upgraded avalanche diode rectifier bridge capable of enduring severe thermal load. The heavy-duty internal voltage regulator delivers consistent charging voltage (14.2V–14.8V) from idle through high RPM. Designed as a direct bolt-on for the High Value V6 platform, it interfaces seamlessly with OEM belt tensioners and OE bracketry while providing immediate relief from electrical strain.
What's Included
- 1 High-Output 250-Amp Alternator
Technical Specifications
| Fitment | 2006-2011 Chevrolet Impala |
|---|---|
| Engine / Chassis | 3.5L (LZ4/LZE), 3.9L (LZ8/LZ9/LGD) / W-Body |
| Stock Output | 211-242 hp / 214-242 lb-ft |
| Replaces OEM Part # | 0124425032, AL88007X, 10335497, 15594, 11185N, 11185R, 11185 |
Compatibility
- 2006-2011 Chevrolet Impala 3.5L V6
- 2006-2011 Chevrolet Impala 3.9L V6
Frequently Asked Questions & Fitment Warnings
Does this fit the W-Body Impala?
Yes, this unit directly fits the 2006-2011 Chevrolet Impala configured with the LZ4 3.5L or LZ9 3.9L V6 engines.
Is a wire upgrade required during installation?
Due to the increased 250A capacity, a 0-gauge or 4-gauge "Big 3" charging wire upgrade is strongly advised to avoid overheating factory charging harnesses.
The Chevrolet Reliability Standard
Engineered to handle sustained electrical loads without thermal throttling, this direct-fit alternator provides steady, ripple-free voltage to safeguard sensitive GM powertrain control modules and sustain auxiliary electronics.
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