{"product_id":"mercury-mariner-boat-side-outboard-wiring-harness-1968-1981-replaces-84-822253a20-sierra-18-99400","title":"Sierra 18-99400 Mercury Mariner Wiring Harness, Replaces 84-822253A20, Fits 1968-1981 Engines","description":"\u003cp\u003eThe Sierra 18-99400 is a boatside wiring harness built for Mercury and Mariner outboard engines, designed to carry the electrical connections between the boat's control side and the outboard powerhead. It is constructed with copper wiring for reliable conductivity and a durable connection under the vibration and moisture exposure typical of marine engine compartments. The harness exits through the side of the lower cowling, matching the routing of the original equipment harness it replaces.\u003c\/p\u003e\u003cp\u003eThis harness fits 1968-1981 Mercury and Mariner engines that use the 414-2770, 414-3369, and 414-5532 OEM harnesses, and is a direct equivalent for several factory Mercury\/Mariner part numbers. It uses a 3.5mm jack connector and measures 11 x 8.5 x 4.5 inches as packaged, weighing 4.2 pounds. Boat owners and marine technicians use this harness to replace a cracked, corroded, or failing original wiring harness without having to source discontinued factory parts.\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 18-99400\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282394332\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 4.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 11 x 8.5 x 4.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e 3.5mm Jack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHarness Exit:\u003c\/strong\u003e Side of lower cowling\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury\/Mariner engines, 1968-1981, using the 414-2770, 414-3369, or 414-5532 OEM harnesses\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e84-822253A20\u003c\/li\u003e\n\u003cli\u003e84-822253T20\u003c\/li\u003e\n\u003cli\u003e45876A10\u003c\/li\u003e\n\u003cli\u003e45876A15\u003c\/li\u003e\n\u003cli\u003e45876A20\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-99400 wiring harness fit?\u003c\/strong\u003e The 18-99400 fits Mercury and Mariner engines from 1968-1981 that use the 414-2770, 414-3369, or 414-5532 OEM harnesses.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99400 a direct replacement for the factory Mercury harness?\u003c\/strong\u003e Yes, it replaces OEM Mercury\/Mariner part numbers 84-822253A20, 84-822253T20, 45876A10, 45876A15, and 45876A20.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the 18-99400 harness made of?\u003c\/strong\u003e This Sierra wiring harness uses copper wiring for reliable electrical conductivity in the marine engine environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-99400 wiring harness weigh?\u003c\/strong\u003e The Sierra 18-99400 weighs 4.2 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-99400 harness?\u003c\/strong\u003e As packaged, the 18-99400 measures 11 x 8.5 x 4.5 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere does the wiring harness exit the engine cowling?\u003c\/strong\u003e The 18-99400 harness exits through the side of the lower cowling, matching the original equipment routing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of connector does the 18-99400 use?\u003c\/strong\u003e It is equipped with a 3.5mm jack connector.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-99400 fit any Mercury outboard regardless of year?\u003c\/strong\u003e No, the 18-99400 is designed for Mercury\/Mariner engines built between 1968 and 1981 that use the 414-2770, 414-3369, or 414-5532 OEM harnesses; check your engine's original harness number before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace my boat's wiring harness?\u003c\/strong\u003e A wiring harness like the 18-99400 is typically replaced when the original becomes cracked, corroded, or develops intermittent electrical connections from age and marine exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this harness sold as a complete boatside unit?\u003c\/strong\u003e Yes, the Sierra 18-99400 is supplied as a complete boatside wiring harness ready to connect between the boat controls and the outboard.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988442919131,"sku":"SIE-18-99400","price":320.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-474-9550_lg__79635.1558112951.500.750.jpg?v=1785188176","url":"https:\/\/www.goodvibesmarina.com\/products\/mercury-mariner-boat-side-outboard-wiring-harness-1968-1981-replaces-84-822253a20-sierra-18-99400","provider":"Good Vibes Marina","version":"1.0","type":"link"}