{"product_id":"rectifier-for-omc-evinrude-johnson-outboards-replaces-582399-583408-6-10-amp-sierra-18-5708","title":"Sierra 18-5708 Rectifier for Evinrude\/OMC Outboards 50-85 HP, Replaces OMC 582399 583408","description":"\u003cp\u003eThe Sierra 18-5708 is a voltage rectifier built for Evinrude\/OMC outboard motors, converting the alternating current from the engine's stator into direct current to charge the battery and power onboard electrical systems. As the charging system fails to keep the battery topped off, or the engine shows signs of an overcharging or no-charge condition, the rectifier is one of the first components to inspect, and the 18-5708 is a direct replacement for the original units used across a wide range of Evinrude\/OMC outboard horsepower classes.\u003c\/p\u003e\u003cp\u003eThis rectifier is finished in white and is a compact, sealed component designed to mount in the original location using the factory hardware pattern. It carries the Sierra part number 18-5708 and cross-references directly to OMC part numbers 582399 and 583408, so it can be ordered as a like-for-like replacement without modification to the surrounding wiring harness. Sierra backs the part with its standard limited warranty coverage, and every unit is manufactured to fit the outboard applications listed below without further adaptation.\u003c\/p\u003e\u003cp\u003eFitment spans a broad range of Evinrude\/OMC outboards by horsepower and model year, including 50, 55, 60 (including the SST60), 65, 70, 75, and 85 HP engines produced across multiple production years. Always confirm the horsepower and model year of the outboard against the fitment list before ordering to ensure the 18-5708 is the correct rectifier for the application.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-5708\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Outboard Rectifier\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999236722\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e OMC 582399, OMC 583408\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEvinrude\/OMC 50 HP, 1971-75\u003c\/li\u003e\n\u003cli\u003eEvinrude\/OMC 55 HP, 1976-77\u003c\/li\u003e\n\u003cli\u003eEvinrude\/OMC 60 HP, 1970, 1971\u003c\/li\u003e\n\u003cli\u003eEvinrude\/OMC 60 HP, 1989-91\u003c\/li\u003e\n\u003cli\u003eEvinrude\/OMC SST60, 1989-90\u003c\/li\u003e\n\u003cli\u003eEvinrude\/OMC 65 HP, 1972-73, 1988-91\u003c\/li\u003e\n\u003cli\u003eEvinrude\/OMC 70 HP, 1992-01\u003c\/li\u003e\n\u003cli\u003eEvinrude\/OMC 75 HP, 1975-88\u003c\/li\u003e\n\u003cli\u003eEvinrude\/OMC 85 HP, 1970-80\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOMC 582399\u003c\/li\u003e\n\u003cli\u003eOMC 583408\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-5708 rectifier do?\u003c\/strong\u003e It converts the alternating current produced by an Evinrude\/OMC outboard's stator into direct current, which is what charges the battery and runs the boat's electrical system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich outboards fit the Sierra 18-5708?\u003c\/strong\u003e The 18-5708 fits Evinrude\/OMC outboards including 50 HP (1971-75), 55 HP (1976-77), 60 HP (1970, 1971 and again 1989-91), SST60 (1989-90), 65 HP (1972-73, 1988-91), 70 HP (1992-01), 75 HP (1975-88), and 85 HP (1970-80).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5708 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra-manufactured aftermarket rectifier built to replace the original OMC unit, cross-referencing directly to OMC part numbers 582399 and 583408.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-5708 replace?\u003c\/strong\u003e The Sierra 18-5708 replaces OMC 582399 and OMC 583408.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-5708 rectifier weigh?\u003c\/strong\u003e The 18-5708 rectifier weighs 0.15 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-5708?\u003c\/strong\u003e It is finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the SST60 outboard use the same rectifier as the standard 60 HP model?\u003c\/strong\u003e Yes, the SST60 (1989-90) uses the same Sierra 18-5708 rectifier as the 60 HP Evinrude\/OMC outboards from 1989-91.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the signs a rectifier like the 18-5708 needs to be replaced?\u003c\/strong\u003e A failing rectifier typically shows up as a battery that will not hold a charge, an overcharging condition, or erratic charging system readings on an Evinrude\/OMC outboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the 18-5708 straightforward?\u003c\/strong\u003e The Sierra 18-5708 is designed as a direct replacement for the original OMC 582399 or 583408 rectifier, mounting in the factory location using the existing wiring connections.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-5708?\u003c\/strong\u003e Each order includes one Sierra 18-5708 rectifier.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra offer a warranty on the 18-5708 rectifier?\u003c\/strong\u003e Yes, the 18-5708 is covered under Sierra's standard limited warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988228714715,"sku":"SIE-18-5708","price":40.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5708_lg__32168.1558128745.500.750.jpg?v=1785188423","url":"https:\/\/www.goodvibesmarina.com\/products\/rectifier-for-omc-evinrude-johnson-outboards-replaces-582399-583408-6-10-amp-sierra-18-5708","provider":"Good Vibes Marina","version":"1.0","type":"link"}