{"product_id":"high-output-alternator-for-hummer-h3-2008-2009-5-3l","title":"High Output Alternator for Hummer H3 (2008-2009) 5.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHigh-Amp 300A Performance Alternator for 2008-2009 Hummer H3 (GMT345)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The High Output 300-Amp Alternator replaces the low-output factory charging unit on the 2008-2009 Hummer H3 5.3L to provide consistent charging voltage and eliminate electrical starvation under heavy accessory loads.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Hummer H3 Charging System Limitations\u003c\/h3\u003e\n\u003cp\u003eThe factory 145-amp charging unit on the \u003cstrong\u003eGMT345\u003c\/strong\u003e Hummer H3 was engineered strictly for factory electrical demand. When owners equip the \u003cstrong\u003eLH8\u003c\/strong\u003e 5.3L V8 with high-draw equipment—such as auxiliary off-road lighting, overland recovery winches, audio amplifiers, or dual-battery setups—the OEM alternator suffers rapid thermal degradation. Under low-RPM crawling conditions, standard units fail to maintain 13.8+ system volts, leading to battery drainage, ignition coil voltage sag, and premature diode failure from persistent heat soak.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eManufactured in the USA, this direct-replacement 300-amp alternator solves high-demand electrical deficits. Engineered with heavy-duty copper windings, precision-wound stators, and premium avalanche diodes, it significantly elevates idle amperage while handling continuous thermal stress. Its heavy-duty aluminum casing promotes superior heat dissipation across the rectifier bridge. Designed to replace factory units matching OEM part numbers \u003cstrong\u003e10392759\u003c\/strong\u003e, \u003cstrong\u003e15200268\u003c\/strong\u003e, and \u003cstrong\u003e8302N\u003c\/strong\u003e, this unit integrates seamlessly with factory serpentine belt routing and mounting brackets.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x 300-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;\"\u003e2008-2009 Hummer H3\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;\"\u003eLH8 5.3L V8 \/ GMT345\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 \/ 320 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;\"\u003e8302N, 8302, 10392759, 15200268, 15263858, 8400078, AL8529X, 8302-300\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\u003e2008 Hummer H3 Alpha 5.3L V8\u003c\/li\u003e\n  \u003cli\u003e2009 Hummer H3 Alpha 5.3L V8\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 GMT345 H3?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2008-2009 Hummer H3 equipped with the \u003cstrong\u003eLH8\u003c\/strong\u003e 5.3L V8 engine. \u003cstrong\u003eThis alternator does not fit models equipped with the 3.5L or 3.7L inline-5 cylinder engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to upgrade my primary power wiring for this 300-amp alternator?\u003c\/h4\u003e\n\u003cp\u003eA \"Big 3\" electrical upgrade using 0-gauge or 1\/0 AWG cabling from the alternator output to the battery is strongly recommended to safely carry 300 amps without resistance drop.\u003c\/p\u003e\n\n\u003ch3\u003eThe Hummer Off-Road Standard\u003c\/h3\u003e\n\u003cp\u003eThe Hummer H3 Alpha demands unwavering electrical stability whether winching across difficult terrain or running secondary electrical gear. This heavy-duty charging solution restores complete confidence in the harshest trail environments.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67565622886648,"sku":"DS-ED62UK5VJ","price":350.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/high-output-alternator-for-hummer-h3-2008-2009-5-3l-1.jpg?v=1791070392","url":"https:\/\/performancechiptuning.com\/de\/products\/high-output-alternator-for-hummer-h3-2008-2009-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}