250-Amp High-Output Alternator

The JS Alternators JS-WRXSTI-250AMP is a high-output alternator engineered specifically for the 2013-2021 Subaru WRX STI 2.5L models. This unit delivers a robust 250 amps, ensuring reliable power for all electronic components, even under significant demand from audio systems or other accessories. It comes with a stock-size serpentine pulley that can be used with your existing belt. For those needing a different belt length, guidance is available in a linked blog article. A separate adapter plug is included, allowing for a seamless connection between the new high-output alternator and the factory wiring harness. If you require the alternator to charge at a specific voltage setpoint, alternative voltage regulators are available for separate purchase. Installation of a high-output alternator necessitates an upgrade to the vehicle's wiring. It is strongly recommended to install a Big 3 Wiring Upgrade Kit, ideally using 1/0 100% copper wires. JS Alternators offers a discount on their Big 3 Wiring Upgrade Kit with the purchase of this alternator using code BIG3DISCOUNT. Installation instructions are provided, emphasizing battery charge before starting, disconnecting the battery, removing the old alternator and belt, mounting the new unit, and installing the new belt, which may need to be 0.5 to 1 inch shorter. Proper grounding to bare metal and ensuring clean connections are crucial for optimal performance. Users are advised to keep wiring at least 12 inches away from heat sources.