High Output Alternator for GMC Yukon (2005-2006) 4.8L 5.3L
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High-Amp 300A Alternator for 2005-2006 GMC Yukon (GMT800)
What it Does: The 300-Amp High Output Alternator replaces the low-output factory charging unit on the 2005-2006 Yukon to supply continuous, ripple-free 14.4V direct current under heavy secondary electrical loads.
The Stock GMC Yukon Charging Deficit
Factory GMT800 charging systems shipped with modest 105-amp or 145-amp units engineered solely for base cabin electronics. When auxiliary lighting, commercial plows, heavy audio builds, or electric recovery winches are introduced, the OEM stators encounter severe thermal saturation. High underhood ambient temperatures rapidly induce heat soak within the factory internal diodes, precipitating substantial idle voltage sag below 12.6V, chronic battery discharge, and intermittent powertrain control module (PCM) communication faults.
The Engineering Solution
Manufactured in the USA, this high-output direct-replacement unit features heavy-gauge copper hairpin stator windings and a precision-balanced rotor designed to maximize low-RPM output and thermal endurance. A heavy-duty internal bridge rectifier packed with high-capacity avalanche diodes manages peak transient voltage, preventing diode blowout. Dual high-efficiency internal cooling fans optimize continuous convective airflow through the housing, keeping stator operating temperatures safely within spec even under prolonged heavy loads.
What's Included
- 1x 300-Amp High Output Alternator
Technical Specifications
| Fitment | 2005-2006 GMC Yukon |
|---|---|
| Engine / Chassis | Vortec 4800 (LR4), Vortec 5300 (LM7/L59) / GMT800 |
| Stock Output | 285-295 hp / 295-335 lb-ft |
| Replaces OEM Part # | 0-124-525-104, AL8782N, AL8782X, 10371020, 15128978, 15200269, 11075, 11075N, 11075-300 |
Compatibility
- 2005-2006 GMC Yukon 4.8L V8
- 2005-2006 GMC Yukon 5.3L 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 4800 LR4 or Vortec 5300 LM7/L59 V8 engines.
Do I need to upgrade my charging cables?
A 1/0 or 4-gauge "Big 3" charging wire upgrade with an inline fuse is mandatory to handle 300 amps without excessive circuit resistance.
The GMC Heavy-Duty Standard
Engineered for full-size SUVs tasked with heavy towing and remote utility, this alternator maintains rock-solid charging voltage to safeguard starter torque and critical auxiliary equipment.
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