High Output Alternator for GMC Yukon (2005-2006) 6.0L 8.1L
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High-Amp Heavy-Duty 250A Alternator for 2005-2006 GMC Yukon (GMT800)
What it Does: The 250 Amp High Output Alternator replaces the factory charging unit on 2005-2006 GMC Yukon models to provide stable system voltage and prevent electrical drop under high-draw commercial and aftermarket accessories.
The Stock GMC Yukon Electrical Output Limitation
Factory GMT800 charging systems typically rely on 105-amp or 145-amp units (such as original Delco platforms) that struggle under modern continuous loads. When powering high-draw electrical equipment, aftermarket winches, snowplows, auxiliary lighting, or heavy trailer brake harnesses, stock alternators suffer severe voltage sag at idle. Sustained high-current demand overheats the OEM bridge rectifier and stator windings, precipitating premature diode failure, battery drain, and false electrical fault codes across engine sensors.
The Engineering Solution
Engineered to resolve charging deficits, this high-output unit supplies 250 Amps of sustained capacity. Built in the USA using precision-wound high-temperature copper stators and a reinforced rotor assembly, it integrates an upgraded heavy-duty rectifier with premium avalanche diodes to resist extreme underhood thermal soak. This design maintains steady system voltage above 14.2V even under heavy electrical load, preserving battery life and ensuring seamless operation for auxiliary commercial or towing accessories.
What's Included
- 1 Alternator (250 Amp)
Technical Specifications
| Fitment | 2005-2006 GMC Yukon |
|---|---|
| Engine / Chassis | Vortec 6000 (LQ4/LQ9), Vortec 8100 (L18) / GMT800 |
| Stock Output | 335 hp / 380 lb-ft (6.0L), 325 hp / 447 lb-ft (8.1L) |
| Replaces OEM Part # | 10464405, 10464443, 10464453, 10464456, 10464476, 15263859, 19151921, 19244751, 8104644760, 8152260, 8292-250A |
Compatibility
- 2005-2006 GMC Yukon 6.0L V8
- 2005-2006 GMC Yukon 8.1L V8
Frequently Asked Questions & Fitment Warnings
Does this fit the GMT800 Yukon?
Yes, this is a direct bolt-in fit for the 2005-2006 GMC Yukon equipped with the Vortec 6000 (6.0L) and Vortec 8100 (8.1L) engines.
Should I upgrade my charging wiring with this unit?
To safely handle the full 250-amp output and minimize resistance, installing an upgraded "Big 3" 1/0 AWG charging lead and ground wiring is strongly recommended.
The GMC Heavy-Duty Standard
Built for rigorous towing, payload distribution, and heavy trailering duties, this alternator ensures continuous electrical reliability under severe operating conditions.
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