{"product_id":"high-output-alternator-for-mercedes-benz-s-class-1981-1991-3-8l-4-2l-5-0l-5-6l","title":"High Output Alternator for Mercedes Benz S-Class (1981-1991) 3.8L 4.2L 5.0L 5.6L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHigh-Output 150-Amp Alternator for 1981-1991 Mercedes Benz S-Class (W126)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 150 Amp High Output Alternator replaces the low-output factory charging unit on the 1981-1991 Mercedes Benz S-Class to stabilize operating voltage and supply ample electrical current for high-draw aftermarket accessories.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mercedes Benz S-Class Charging Limitation\u003c\/h3\u003e\n\u003cp\u003eFactory \u003cstrong\u003eW126\u003c\/strong\u003e charging systems rely on legacy alternators rated at only 55 to 80 amps. In stock configuration, low rotor speed at idle causes immediate voltage drop whenever modern electrical loads—such as auxiliary thermo-fans, high-draw stereo amplifiers, or digital electronics—are introduced. Over time, excessive thermal stress on the factory diode trio and internal voltage regulator leads to premature component failure, dimming instrument clusters, slow window actuation, and perpetual battery drain during stop-and-go driving.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered as a true bolt-in solution for \u003cstrong\u003eM116\u003c\/strong\u003e and \u003cstrong\u003eM117\u003c\/strong\u003e V8 applications, this new-manufactured 150-amp unit dramatically increases charging capacity across the entire RPM range. Featuring precision-wound copper stators, heavy-duty avalanche diodes, and specialized external cooling vents, it mitigates heat soak under heavy continuous loads. It retains factory mounting geometry, OE pulley alignment, and the original terminal configuration, enabling a hassle-free drop-in installation that preserves original engine bay aesthetics.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1x High-Output 150-Amp 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: solid font-size: min-width:\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;\"\u003e1981-1991 Mercedes Benz S-Class\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;\"\u003eM116 \u0026amp; M117 V8 \/ W126 \u0026amp; C126\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;\"\u003e155–238 hp \/ 196–287 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;\"\u003e\n\u003cstrong\u003e0120469583\u003c\/strong\u003e, \u003cstrong\u003e0120469584\u003c\/strong\u003e, \u003cstrong\u003e0120469588\u003c\/strong\u003e, \u003cstrong\u003eAL69X\u003c\/strong\u003e, \u003cstrong\u003e14783\u003c\/strong\u003e\n\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\u003e1984-1985 Mercedes Benz 380SE 3.8L\u003c\/li\u003e\n  \u003cli\u003e1982-1983 Mercedes Benz 380SEC 3.8L\u003c\/li\u003e\n  \u003cli\u003e1981-1983 Mercedes Benz 380SEL 3.8L\u003c\/li\u003e\n  \u003cli\u003e1986-1991 Mercedes Benz 420SEL 4.2L\u003c\/li\u003e\n  \u003cli\u003e1984-1985 Mercedes Benz 500SEC 5.0L\u003c\/li\u003e\n  \u003cli\u003e1984-1985 Mercedes Benz 500SEL 5.0L\u003c\/li\u003e\n  \u003cli\u003e1986-1991 Mercedes Benz 560SEC 5.6L\u003c\/li\u003e\n  \u003cli\u003e1986-1991 Mercedes Benz 560SEL 5.6L\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 W126 S-Class?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for 1981-1991 Mercedes Benz S-Class sedans and coupes equipped with factory \u003cstrong\u003eM116\u003c\/strong\u003e and \u003cstrong\u003eM117\u003c\/strong\u003e V8 engines.\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to upgrade the charging wire?\u003c\/h4\u003e\n\u003cp\u003eWhile standard installations utilize stock wiring, upgrading to a heavier-gauge main charging wire and chassis ground is strongly recommended to handle peak 150-amp current safely and efficiently.\u003c\/p\u003e\n\n\u003ch3\u003eThe Mercedes Benz Standard\u003c\/h3\u003e\n\u003cp\u003eMaintaining classic German luxury engineering requires pristine electrical integrity; this unit provides the stable operating voltage needed to keep your flagship sedan functioning seamlessly without electrical fault warnings or dimming instrumentation.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67621506253048,"sku":"DS-E4UEO51D4","price":438.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/high-output-alternator-for-mercedes-benz-s-class-1981-1991-3-8l-4-2l-5-0l-5-6l-1.jpg?v=1791663204","url":"https:\/\/performancechiptuning.com\/de\/products\/high-output-alternator-for-mercedes-benz-s-class-1981-1991-3-8l-4-2l-5-0l-5-6l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}