{"product_id":"high-output-alternator-for-acura-rl-2009-2012-3-7l","title":"High Output Alternator for Acura RL (2009-2012) 3.7L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHigh-Output 250A Alternator for 2009-2012 Acura RL (KB2)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 250-Amp High-Output Alternator replaces the low-output factory charging unit on the 2009-2012 Acura RL to supply stable electrical current and eliminate voltage drop under high electrical loads.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Acura RL Charging Limitation\u003c\/h3\u003e\n\u003cp\u003eThe factory charging system on the \u003cstrong\u003eKB2\u003c\/strong\u003e Acura RL was engineered for stock electronics and delivers roughly 130 amps from the factory Denso unit. The platform's advanced \u003cstrong\u003eJ37A2\u003c\/strong\u003e powertrain is paired with energy-intensive onboard systems, including Super Handling All-Wheel Drive (SH-AWD), active noise cancellation, heated power accessories, and complex multi-module CAN bus networks. When owners add aftermarket audio, high-draw auxiliary lighting, or run full cabin climate control at idle, the stock alternator reaches peak duty cycle quickly. This causes heat soak across the internal diode bridge, severe voltage drops below 12.8 volts, premature battery drain, and irregular transmission or SH-AWD module fault codes caused by system voltage fluctuations.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eManufactured in the USA, this heavy-duty 250-amp upgrade resolves charging bottlenecks by utilizing high-efficiency internal stators and heavy-gauge copper windings capable of producing massive amperage at both idle and cruising RPMs. The assembly incorporates a heavy-duty 12-diode rectifier and premium heat-sink casing engineered for maximum thermal dissipation under demanding engine bay temperatures. Designed as a direct bolt-in unit, it preserves factory serpentine belt alignment and plugs straight into the factory harness, directly replacing OEM part numbers \u003cstrong\u003e31100-RGW-A01\u003c\/strong\u003e and \u003cstrong\u003e104210-5920\u003c\/strong\u003e without mounting bracket alterations.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1x 250-Amp High Output Alternator\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2009-2012 Acura RL\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eJ37A2 \/ KB2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e300 hp \/ 271 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e104210-5920, 11391N, 11391R, 31100-RGW-A01, 31100-RGW-A01RM, CSF92, 11391, 11391-250A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2009 Acura RL 3.7L V6 (All Trims)\u003c\/li\u003e\n  \u003cli\u003e2010 Acura RL 3.7L V6 (All Trims)\u003c\/li\u003e\n  \u003cli\u003e2011 Acura RL 3.7L V6 (All Trims)\u003c\/li\u003e\n  \u003cli\u003e2012 Acura RL 3.7L V6 (All Trims)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the KB2 RL?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct bolt-in fit for the 2009-2012 Acura RL equipped with the 3.7L \u003cstrong\u003eJ37A2\u003c\/strong\u003e engine.\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to upgrade my main charging cables with a 250A alternator?\u003c\/h4\u003e\n\u003cp\u003eYes, executing a \"Big 3\" wiring upgrade with 1\/0 or 4-gauge oxygen-free copper cables from the alternator charge stud to the battery and chassis ground is strongly recommended to safely carry 250 amps.\u003c\/p\u003e\n\n\u003ch3\u003eThe Acura Caliber\u003c\/h3\u003e\n\u003cp\u003eThe advanced Japanese luxury and torque-vectoring systems in the KB2 platform rely on rock-solid operating voltage; upgrading to a 250-amp platform guarantees clean power delivery, uncompromised ECU communication, and long-term charging reliability.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67565776011512,"sku":"DS-EJX40UKA0","price":249.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/high-output-alternator-for-acura-rl-2009-2012-3-7l-1.jpg?v=1791074911","url":"https:\/\/performancechiptuning.com\/fr\/products\/high-output-alternator-for-acura-rl-2009-2012-3-7l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}