{"product_id":"sierra-18-99519-insulator-blocks-for-mercury-outboard-ignition-replaces-cdi-994-3981-2-pack","title":"Sierra Insulator Blocks 18-99519, Replaces Mercury CDI Electronics 994-3981, 2-Pack","description":"\u003cp\u003eThe Sierra 18-99519 Insulator Blocks are a 2-pack replacement component used in marine ignition systems, designed as an equivalent to the Mercury CDI Electronics 994-3981 insulator block. Insulator blocks mount ignition components such as coils or switch boxes while electrically isolating them from the engine mounting surface, protecting sensitive ignition circuitry from stray current and vibration-related wear. Each block uses a screw-type connector for secure installation.\u003c\/p\u003e\u003cp\u003eSold as a pack of two, these insulator blocks are a lightweight, low-cost part to keep on hand for ignition system maintenance or repair. Because they are designed to match the Mercury CDI Electronics 994-3981 insulator block, they can be used as a direct equivalent when servicing compatible ignition setups.\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 18-99519\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 per pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits ignition systems using the Mercury CDI Electronics 994-3981 insulator block.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury CDI Electronics 994-3981\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-99519 insulator block used for?\u003c\/strong\u003e The Sierra 18-99519 insulator block mounts and electrically isolates ignition components, such as coils or switch boxes, from the engine mounting surface in a marine ignition system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many insulator blocks come in this package?\u003c\/strong\u003e The Sierra 18-99519 is sold as a 2-pack, giving you two insulator blocks per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-99519 replace the Mercury CDI Electronics 994-3981 insulator block?\u003c\/strong\u003e Yes, the Sierra 18-99519 is designed as an equivalent to the Mercury CDI Electronics 994-3981 insulator block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of connector does this insulator block use?\u003c\/strong\u003e This insulator block uses a screw-type connector for mounting and installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-99519 insulator block weigh?\u003c\/strong\u003e Each package of the Sierra 18-99519 insulator blocks weighs 0.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99519 an OEM or aftermarket part?\u003c\/strong\u003e The Sierra 18-99519 is an aftermarket insulator block manufactured to match the Mercury CDI Electronics 994-3981 part for compatible ignition system repairs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the Sierra 18-99519 to replace just one damaged insulator block?\u003c\/strong\u003e Since the Sierra 18-99519 comes as a 2-pack, you will have a spare block on hand even if you only need to replace one damaged unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat ignition components typically use this insulator block?\u003c\/strong\u003e Insulator blocks like the Sierra 18-99519 are typically used to mount ignition coils or switch boxes while isolating them from the engine mounting surface.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation of the Sierra 18-99519 straightforward?\u003c\/strong\u003e Yes, the Sierra 18-99519 uses a simple screw connector, making it straightforward to install in place of the original insulator block.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the Sierra 18-99519?\u003c\/strong\u003e An order of the Sierra 18-99519 includes two insulator blocks (a 2-pack).\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988445311195,"sku":"SIE-18-99519","price":14.42,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-994-3981_lg__48384.1558115257.500.750.jpg?v=1785188869","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-99519-insulator-blocks-for-mercury-outboard-ignition-replaces-cdi-994-3981-2-pack","provider":"Good Vibes Marina","version":"1.0","type":"link"}