High Output Alternator for Oldsmobile Bravada (2002-2004) 4.2L
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High-Amperage 250A Direct-Fit Alternator for 2002-2004 Oldsmobile Bravada (GMT360)
What it Does: The 250 Amp High Output Alternator upgrades the factory charging system on the 2002-2004 Oldsmobile Bravada to eliminate voltage drop and deliver consistent current under heavy electrical loads.
The Stock Oldsmobile Bravada Charging Bottleneck
The factory charging system on the GMT360 platform relies on a standard Delphi AD244 or CS130D series unit rated around 100 to 150 amps. When running auxiliary lighting, aftermarket audio amplifiers, or towing accessories, the stock stator windings overheat and experience severe thermal degradation. At idle, the factory unit fails to maintain system voltage above battery resting threshold, leading to dimming headlamps, ECM voltage fluctuation, and premature battery degradation under sustained amp draw.
The Engineering Solution
Assembled in the USA, this 250-amp heavy-duty charging unit features high-temperature copper windings and a heavy-duty rectifier assembly equipped with high-amp press-fit diodes for maximum heat dissipation. The unit delivers over 150 amps at engine idle speeds, maintaining a stable 14.4-volt charging profile across the entire RPM range of the Atlas LL8 engine. High-grade bearings resist radial load fatigue from the serpentine drive belt, resolving voltage sag without requiring chassis modifications.
What's Included
- 1 250-Amp High Output Alternator
Technical Specifications
| Fitment | 2002-2004 Oldsmobile Bravada |
|---|---|
| Engine / Chassis | 4.2L Atlas LL8 (Vortec 4200) / GMT360 |
| Stock Output | 270-275 hp / 275 lb-ft |
| Replaces OEM Part # | 321-1828, 334-2527, 8290, 8290n, 8104644680, 10464468, 15062413, 8290-250A |
Compatibility
- 2002 Oldsmobile Bravada Base 4.2L L6
- 2003 Oldsmobile Bravada Base 4.2L L6
- 2004 Oldsmobile Bravada Base 4.2L L6
Frequently Asked Questions & Fitment Warnings
Does this fit the GMT360 Bravada?
Yes, this is a direct bolt-on fit for the 2002-2004 Oldsmobile Bravada equipped with the Atlas LL8 4.2L inline-6 engine.
Do I need to upgrade my main power wiring?
A "Big 3" wiring upgrade with 1/0 AWG charging cable and auxiliary ground is strongly recommended to handle 250 amps safely and prevent line resistance drops.
The Oldsmobile Truck Durability Standard
Engineered for the demands of full-frame sport utility towing and continuous accessory draw, this unit supplies stable reserve capacity to preserve critical onboard electronics and harness integrity under sustained load.
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