High Output Alternator for Lexus IS250 IS350 (2006-2012) 2.5L 3.5L
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High-Output 250A Alternator for 2006-2012 Lexus IS (XE20)
What it Does: The 250-amp high output alternator replaces the factory charging unit on the 2006-2012 Lexus IS to eliminate idle voltage drop and sustain high-draw electrical accessories.
The Stock Lexus IS Charging System Bottleneck
Factory XE20 charging systems utilize alternators rated between 100 to 150 amps, engineered purely for baseline electronic loads. Once you install aftermarket audio amplifiers, air management compressors, or auxiliary lighting, the OEM traditional wound-stator experiences rapid thermal saturation. At idle speeds—where engine rotation hovers around 650–750 RPM—the factory alternator fails to supply sufficient amperage, resulting in headlamp dimming, battery discharge, and unstable voltage drops that interfere with sensitive engine sensors.
The Engineering Solution
This unit incorporates an advanced hairpin stator design using square copper wire to maximize internal slot fill and drop internal resistance. The increased conductor density dissipates heat more effectively than round-wire designs, minimizing heat soak during prolonged operation. Delivering up to 250 amps of continuous power, this direct-fit unit matches factory pulley offset and plug connectors while keeping system voltage stable at 14.4 volts under heavy accessory demand.
What's Included
- 1x 250-Amp High Output Alternator
Technical Specifications
| Fitment | 2006-2012 Lexus IS |
|---|---|
| Engine / Chassis | 4GR-FSE (2.5L), 2GR-FSE (3.5L) / XE20 |
| Stock Output | 204 hp / 185 lb-ft (2.5L) | 306 hp / 277 lb-ft (3.5L) |
| Replaces OEM Part # | 27060-31062, 210-0656, 104210-2050, 104210-2051, 104210-4680, 27060-31060, 27060-31061, AL3356X, 11196, 11196R, 11196N |
Compatibility
- 2006-2012 Lexus IS250 2.5L V6
- 2006-2012 Lexus IS350 3.5L V6
Frequently Asked Questions & Fitment Warnings
Does this fit the XE20 IS?
Yes, this is a direct bolt-in fit for the 2006-2012 Lexus IS equipped with the 4GR-FSE 2.5L or 2GR-FSE 3.5L V6 engine.
Do I need to upgrade my charging wiring?
To realize the full 250-amp capability under heavy sustained electrical draws, performing a 1/0 AWG Big-3 battery ground and alternator charge wire upgrade is recommended.
The Lexus Caliber
The XE20 sport sedan depends heavily on precise electrical signaling to run its direct-injection drivers and electric power steering, making clean, uninterrupted voltage critical to overall performance.
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