{"product_id":"339-7452a19-339-7452a1-switch-box-cdi-for-mercury-mariner-jlm-marine","title":"339-7452A19 339-7452A1 Switch Box CDI for Mercury Mariner | JLM Marine","description":"\u003ch2\u003eSwitch Box CDI for Mercury Mariner – Fits 6-35 HP 2-Stroke Outboards\u003c\/h2\u003e\n\n\u003cp\u003eThis aftermarket CDI switch box is designed for Mercury Mariner 2-stroke outboard engines ranging from 6 HP to 35 HP. It provides reliable ignition control for two-cylinder models from 1980 to 1997 and newer 6-25 HP models from 1999 onward, ensuring consistent spark delivery and engine performance across a wide range of applications.\u003c\/p\u003e\n\n\u003cp\u003eThis unit directly replaces multiple Mercury\/Quicksilver OEM part numbers including 339-7452A1, 339-7452A19, 339-7452A15, 339-7452A17, and many others, as well as Sierra 18-5777. It is compatible with engines using the bullet connection pack.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eFits 6, 8, 9.9, 10, 15, 20, 25, and 35 HP Mercury Mariner 2-stroke engines\u003c\/li\u003e\n\u003cli\u003eCompatible with 1980-1997 models using bullet connection pack and 1999+ two-cylinder models\u003c\/li\u003e\n\u003cli\u003eDirect replacement for 339-7452A series and Sierra 18-5777\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A17\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A18\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A19\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Quicksilver\u003c\/td\u003e\n\u003ctd\u003e339-7452A21 (Wires)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-5777\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket\u003c\/td\u003e\n\u003ctd\u003e114-7452K1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eTwo Cylinder\u003c\/td\u003e\n\u003ctd\u003e6 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999 \u0026amp; Newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eTwo Cylinder\u003c\/td\u003e\n\u003ctd\u003e8 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999 \u0026amp; Newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eTwo Cylinder\u003c\/td\u003e\n\u003ctd\u003e9.9 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999 \u0026amp; Newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eTwo Cylinder\u003c\/td\u003e\n\u003ctd\u003e10 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999 \u0026amp; Newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eTwo Cylinder\u003c\/td\u003e\n\u003ctd\u003e15 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999 \u0026amp; Newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eTwo Cylinder\u003c\/td\u003e\n\u003ctd\u003e20 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999 \u0026amp; Newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eTwo Cylinder\u003c\/td\u003e\n\u003ctd\u003e25 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1999 \u0026amp; Newer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eBullet Connection Pack\u003c\/td\u003e\n\u003ctd\u003e6 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980-1997\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eBullet Connection Pack\u003c\/td\u003e\n\u003ctd\u003e8 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980-1997\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eBullet Connection Pack\u003c\/td\u003e\n\u003ctd\u003e9.9 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980-1997\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eBullet Connection Pack\u003c\/td\u003e\n\u003ctd\u003e10 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980-1997\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eBullet Connection Pack\u003c\/td\u003e\n\u003ctd\u003e15 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980-1997\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eBullet Connection Pack\u003c\/td\u003e\n\u003ctd\u003e20 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980-1997\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eBullet Connection Pack\u003c\/td\u003e\n\u003ctd\u003e25 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980-1997\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003ctd\u003eBullet Connection Pack\u003c\/td\u003e\n\u003ctd\u003e35 HP\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980-1997\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eCDI Switch Box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eIgnition Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eMercury Mariner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Type\u003c\/td\u003e\n\u003ctd\u003e2-Stroke Outboard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Configuration\u003c\/td\u003e\n\u003ctd\u003eTwo Cylinder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHorsepower Range\u003c\/td\u003e\n\u003ctd\u003e6-35 HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection Type\u003c\/td\u003e\n\u003ctd\u003eBullet Connection Pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eThis package includes:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 × CDI Switch Box Unit\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisconnect the battery:\u003c\/strong\u003e Remove the negative terminal from the battery to ensure safety during installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocate the old CDI switch box:\u003c\/strong\u003e It is typically mounted near the engine block or under the cowling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisconnect the wiring harness:\u003c\/strong\u003e Carefully pull apart the bullet connectors from the old CDI unit, noting the wire positions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove mounting hardware:\u003c\/strong\u003e Unscrew or unbolt the old CDI switch box from its mounting location.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition the new CDI unit:\u003c\/strong\u003e Place the new switch box in the same location as the old unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure the new unit:\u003c\/strong\u003e Use the original mounting screws or bolts to firmly attach the CDI box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReconnect the wiring harness:\u003c\/strong\u003e Attach each bullet connector to the corresponding terminal on the new CDI unit, ensuring a secure fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify all connections:\u003c\/strong\u003e Double-check that all wires are properly connected and no terminals are exposed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReconnect the battery:\u003c\/strong\u003e Attach the negative terminal back to the battery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest the ignition system:\u003c\/strong\u003e Turn the key to the \"on\" position and attempt to start the engine to verify proper operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this CDI switch box fits my Mercury engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Check the compatibility table above for your engine's horsepower, year, and stroke type. You can also verify the OEM part number stamped on your existing CDI unit against the cross-reference table to ensure a match.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my CDI switch box is failing?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include difficulty starting the engine, misfiring, loss of power at high RPM, irregular idling, or complete failure to start. If you experience these issues after ruling out spark plugs and fuel delivery problems, the CDI may need replacement.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Will this work with engines that have a different connector type?\u003c\/strong\u003e\u003cbr\u003e\nA: This CDI is designed specifically for engines using the bullet connection pack. If your engine uses a different connector style, this unit may not be compatible without modification or an adapter harness.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the CDI switch box?\u003c\/strong\u003e\u003cbr\u003e\nA: CDI units typically do not require routine replacement and should last many years under normal operating conditions. Replace the CDI only when it shows signs of failure or after exposure to water damage, corrosion, or electrical surges.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM part or aftermarket?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51981010993465,"sku":"24CD386","price":31.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_b684e80f-5d35-40fa-b453-32d3907c7f2c.jpg?v=1772414585","url":"https:\/\/jlmmarine.com\/ru\/products\/339-7452a19-339-7452a1-switch-box-cdi-for-mercury-mariner-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}