High Output Alternator for Hummer H2 (2003-2007) 6.0L
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Heavy-Duty 250-Amp High-Output Alternator for 2003-2007 Hummer H2 (GMT820)
What it Does: The 250-Amp High-Output Alternator replaces the factory charging unit on the 2003-2007 Hummer H2 to provide stable, elevated amperage output and prevent severe voltage drops under high-demand electrical loads.
The Stock Hummer H2 Electrical Shortcoming
Factory Delco 145-amp and 160-amp units on the GMT820 platform are severely taxed when supporting aftermarket winches, auxiliary LED light bars, dual-battery systems, or high-draw audio setups. Under sustained electrical pull, the OEM internal rectifier and thin stator windings experience severe thermal saturation, causing idle voltage drops below 12.6V, dimming lights, and eventual diode bridge breakdown from excessive heat soak.
The Engineering Solution
Engineered for sustained heavy-duty current delivery, this direct-fit alternator incorporates heavy-gauge pure copper stator windings and an oversized internal heat sink with heavy-duty avalanche diodes. Housed inside a precision-cast, vented aluminum case that mounts directly to the accessory bracket of the 6.0L LQ4 Vortec engine, it produces dependable idle amperage and up to 250 amps at cruising RPM, stabilizing system voltage and preventing regulator burnout under extreme auxiliary draw.
What's Included
- 1x 250-Amp High-Output Alternator
Technical Specifications
| Fitment | 2003-2007 Hummer H2 |
|---|---|
| Engine / Chassis | 6.0L LQ4 Vortec / GMT820 |
| Stock Output | 316-325 hp / 360-365 lb-ft |
| Replaces OEM Part # | 10464405, 10464443, 10464453, 10464456, 10464476, 15263859, 19151921, 19244751, 8104644760, 8152260, 8292-250A |
Compatibility
- 2003-2007 Hummer H2 Base Sport Utility 4-Door 6.0L V8
- 2005-2007 Hummer H2 SUT Crew Cab Pickup 4-Door 6.0L V8
Frequently Asked Questions & Fitment Warnings
Does this fit the GMT820 H2?
Yes, this is a direct bolt-on fit for the 2003-2007 Hummer H2 equipped with the 6.0L LQ4 engine. This unit does not fit 2008-2009 Hummer H2 models equipped with the 6.2L L92 engine.
Do I need to upgrade the primary charging cable?
A "Big 3" wiring upgrade utilizing heavy-gauge 1/0 or 4 AWG power and ground cables is strongly recommended to safely transmit the full 250-amp capacity without line resistance.
The Hummer Heavy-Duty Standard
Designed to handle the brutal electrical demands of high-tonnage recovery winches and remote expedition gear, this high-output unit ensures continuous, regulated voltage delivery to preserve your truck's ignition and sensitive control modules across harsh terrain.
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