{"product_id":"sierra-18-5852-shrouded-relay-for-mercury-mariner-45-50-hp-four-stroke-outboards-replaces-821509-853292","title":"Sierra 18-5852 Shrouded Starter Relay, Replaces 821509T01\/821509\/853292, Fits Mercury\/Mariner Four-Stroke 45 HP and 50 HP Outboards","description":"\u003cp\u003eThe Sierra 18-5852 is a shrouded starter relay engineered as a direct replacement for the OEM relay on select Mercury and Mariner Four-Stroke outboard engines. The shrouded housing protects the internal contacts and screw terminals from moisture, salt spray, and engine-bay debris, which is critical for a component that lives in the harsh marine environment and controls high-current starter and power trim circuits. It uses a normally-open contact design with copper contacts and screw-type connectors for a secure, corrosion-resistant electrical connection, and it is designed to mount directly to the engine in the factory location.\u003c\/p\u003e\u003cp\u003eThis relay is built for Four-Stroke Mercury\/Mariner 45 HP outboards within the serial number range 0G231123 to 0G472132, and Four-Stroke 50 HP outboards within the serial number range 0G231123 to 0T178499. It replaces Mercury\/Mariner relay part numbers 821509T01, 821509, and 853292, so it is a straightforward swap for a failed or corroded factory relay. Sierra engineers its parts to meet or exceed the specifications of the original equipment part being replaced, and every Sierra part is backed by the company's Customer Satisfaction Warranty covering defects in workmanship and materials.\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 18-5852\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Relay, Shrouded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Trim Relays\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContact Material:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContact Type:\u003c\/strong\u003e Normally Open\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Engine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.6 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282292546\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury\/Mariner Four-Stroke 45 HP, Serial Range 0G231123 to 0G472132\u003c\/li\u003e\n\u003cli\u003eMercury\/Mariner Four-Stroke 50 HP, Serial Range 0G231123 to 0T178499\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e821509T01\u003c\/li\u003e\n\u003cli\u003e821509\u003c\/li\u003e\n\u003cli\u003e853292\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-5852 relay fit?\u003c\/strong\u003e The Sierra 18-5852 shrouded relay fits Mercury\/Mariner Four-Stroke 45 HP outboards in the serial number range 0G231123 to 0G472132, and Four-Stroke 50 HP outboards in the serial number range 0G231123 to 0T178499.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-5852 replace?\u003c\/strong\u003e It replaces Mercury\/Mariner relay part numbers 821509T01, 821509, and 853292.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-5852 relay a genuine Mercury part or an aftermarket equivalent?\u003c\/strong\u003e The 18-5852 is a Sierra-manufactured replacement relay, not a genuine Mercury\/Mariner part, but it is built to replace OEM numbers 821509T01, 821509, and 853292 and is engineered to meet or exceed the original part's specifications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of electrical contacts does this relay use?\u003c\/strong\u003e The Sierra 18-5852 uses copper contacts in a normally-open configuration, with screw-type connectors for the wiring terminals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy is the relay described as shrouded?\u003c\/strong\u003e The 18-5852 has a shrouded housing that encloses the relay body, protecting the internal contacts and terminals from moisture and debris in the engine compartment, which extends its service life in a marine environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-5852 relay mounted?\u003c\/strong\u003e This relay uses an engine mounting type, meaning it installs directly onto the outboard engine in the factory relay location.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-5852 relay weigh?\u003c\/strong\u003e The Sierra 18-5852 shrouded relay weighs 0.6 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many relays come in the package?\u003c\/strong\u003e The Sierra 18-5852 ships as a single relay, a unit count of 1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-5852 work on a 40 HP or 60 HP Four-Stroke Mercury outboard?\u003c\/strong\u003e Sierra lists the 18-5852 specifically for Four-Stroke 45 HP (serial range 0G231123 to 0G472132) and 50 HP (serial range 0G231123 to 0T178499) Mercury\/Mariner outboards; engines outside these HP ratings or serial ranges are not covered by this listing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-5852 come with a warranty?\u003c\/strong\u003e Yes, the 18-5852 is covered under Sierra's Customer Satisfaction Warranty, which covers defects in workmanship and materials for the useful life of the product, subject to Sierra's standard warranty terms.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-5852 relay?\u003c\/strong\u003e The UPC for the Sierra 18-5852 shrouded relay is 808282292546.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988328132827,"sku":"SIE-18-5852","price":18.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5852__94143.1558188955.500.750.jpg?v=1785188551","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-5852-shrouded-relay-for-mercury-mariner-45-50-hp-four-stroke-outboards-replaces-821509-853292","provider":"Good Vibes Marina","version":"1.0","type":"link"}