{"product_id":"marine-alternator-12v-55a-replaces-mercruiser-817119a1","title":"Marine Alternator 12V 55A – Replaces MerCruiser 817119A1 | SKU 57-60050","description":"\u003cp\u003eA reliable aftermarket replacement alternator for MerCruiser sterndrive and inboard engines. This 12-volt, 55-amp unit replaces MerCruiser OEM part number 817119A1 and is a direct-fit drop-in with an internal voltage regulator, single groove pulley, and 2-inch mounting foot — no additional wiring or regulator changes required. If your charging system is underperforming, showing a low voltage warning, or the alternator has failed outright, this is the correct replacement for the applications listed below.\u003c\/p\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eMerCruiser 5.0L (305 CID) V8 sterndrive engines\u003c\/li\u003e\n  \u003cli\u003eMerCruiser 5.7L (350 CID) V8 sterndrive engines\u003c\/li\u003e\n  \u003cli\u003eMerCruiser 7.4L (454 CID) V8 sterndrive engines\u003c\/li\u003e\n  \u003cli\u003eMerCruiser 8.2L (502 CID) V8 sterndrive engines\u003c\/li\u003e\n  \u003cli\u003eMerCruiser inboard engines equipped with the Delco CS-series alternator and single groove belt drive\u003c\/li\u003e\n  \u003cli\u003eVerify fitment against your engine serial number and parts diagram before ordering — belt routing, pulley count, and mounting foot dimensions must match\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eReplaces\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMerCruiser OEM:\u003c\/strong\u003e 817119A1\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 57-60050\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e 55 Amps\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRegulator:\u003c\/strong\u003e Internal voltage regulator\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePulley:\u003c\/strong\u003e Single groove\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMounting Foot:\u003c\/strong\u003e 2 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Aftermarket direct replacement\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRelated Products\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/mercury-alternator-black-oem-marine-engine-charging-system\"\u003eMercury Alternator (Black) – OEM Marine Engine Charging System\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/quicksilver-70-amp-alternator-delco-serpentine-862031t1\"\u003eQuicksilver 70 Amp Alternator – Delco Serpentine – 862031T1\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/sierra-marine-alternator-high-output-charging-system\"\u003eSierra Marine Alternator – High-Output Charging System\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/pcm-70-amp-marine-alternator-ra097007\"\u003ePCM 70-Amp Marine Alternator – RA097007\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/ac-delco-marine-alternator-high-output-charging-system\"\u003eAC Delco Marine Alternator – High-Output Charging System\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003eThis unit is the right choice when you need a straightforward, cost-effective replacement for a failed or underperforming alternator on a MerCruiser V8 sterndrive with the single groove belt drive configuration. It fits the same footprint as the original Delco unit, so installation is a direct swap — remove the old alternator, transfer the belt and wiring connectors, and torque the mounting foot. The most common issue we see with these is customers ordering without checking pulley groove count: if your engine has a serpentine (multi-groove) belt system, this single groove unit will not fit and you’ll want the \u003ca href=\"\/products\/quicksilver-70-amp-alternator-delco-serpentine-862031t1\"\u003eQuicksilver 862031T1 serpentine alternator\u003c\/a\u003e instead. Always confirm your belt type and mounting foot dimension before ordering. At 55 amps, this alternator is well suited to standard house loads on a mid-size vessel, but if you’re running a large inverter or heavy electronics load, consider a higher-output unit such as the \u003ca href=\"\/products\/sierra-marine-alternator-high-output-charging-system\"\u003eSierra high-output alternator\u003c\/a\u003e.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":50992569450532,"sku":"57-60050","price":393.29,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/57-60050_da52fe72-02ea-4fbe-a4c0-58615c4fe234.jpg?v=1782713944","url":"https:\/\/marisolmarine.com\/products\/marine-alternator-12v-55a-replaces-mercruiser-817119a1","provider":"Marisol Marine Company","version":"1.0","type":"link"}