{"product_id":"mercury-mariner-l6-ignition-coil-primary-wire-set-sierra-18-99328-inline-6-cylinder-outboard","title":"Sierra 18-99328 Ignition Coil Primary Wire Set for Mercury Mariner L6 Outboard Engines","description":"\u003cp\u003eThe Sierra 18-99328 Ignition Coil Primary Wire Set is built for Mercury Mariner inline six-cylinder (L6) outboard engines, supplying the primary-circuit wiring that connects the ignition coils into the engine's ignition system. As engine wiring ages, insulation can crack and connections can loosen or corrode, leading to weak spark, misfires, or hard starting; replacing the primary wire set restores a clean, consistent electrical path between the coil and the rest of the ignition circuit. This set is sized and configured specifically for L6 outboard applications, so it installs in place of the factory wiring without modification. Sierra is a long-established name in marine replacement parts, and this wire set is manufactured to work as a direct functional replacement in the ignition system it is designed for. At just 0.15 pounds, it is a lightweight, straightforward component that a boat owner or marine technician can install during routine ignition maintenance or when troubleshooting an ignition fault on a Mercury Mariner L6 outboard. Keeping the primary wiring in good condition is a simple way to help maintain reliable starting and smooth running.\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 18-99328\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Ignition Coil Primary Wire Set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Configuration:\u003c\/strong\u003e L6 (inline six-cylinder)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercury Mariner outboard engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 736983856883\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-99328 ignition coil primary wire set used for?\u003c\/strong\u003e It supplies the primary-circuit wiring that connects the ignition coils on Mercury Mariner L6 (inline six-cylinder) outboard engines, part number 18-99328.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines does the 18-99328 wire set fit?\u003c\/strong\u003e The 18-99328 primary wire set is configured for Mercury Mariner L6 outboard engines, meaning inline six-cylinder Mercury Mariner outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this ignition coil wire set weigh?\u003c\/strong\u003e The Sierra 18-99328 primary wire set weighs 0.15 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99328 a genuine Sierra part?\u003c\/strong\u003e Yes, 18-99328 is a Sierra brand part number, manufactured as a replacement ignition coil primary wire set for Mercury Mariner L6 outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the ignition coil primary wire set?\u003c\/strong\u003e If a Mercury Mariner L6 outboard is showing weak spark, misfires, or hard starting and the primary ignition wiring shows cracked insulation or corroded connections, replacing the wire set with the Sierra 18-99328 can restore a clean electrical connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes installing the 18-99328 require modifying the engine wiring?\u003c\/strong\u003e No, the Sierra 18-99328 is sized and configured for Mercury Mariner L6 outboard applications so it installs in place of the factory primary wiring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-99328 wire set?\u003c\/strong\u003e The UPC for the Sierra 18-99328 ignition coil primary wire set is 736983856883.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-99328 include the ignition coils themselves?\u003c\/strong\u003e No, 18-99328 is the primary wire set only, used to wire the ignition coils on a Mercury Mariner L6 outboard, not the coils themselves.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this wire set suitable for a technician doing ignition troubleshooting?\u003c\/strong\u003e Yes, the lightweight Sierra 18-99328 primary wire set is a straightforward component for a technician to install while diagnosing or servicing the ignition system on a Mercury Mariner L6 outboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat brand is part number 18-99328?\u003c\/strong\u003e Part number 18-99328 is manufactured by Sierra, a supplier of marine replacement parts, as an ignition coil primary wire set for Mercury Mariner L6 outboard engines.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988442231003,"sku":"SIE-18-99328","price":49.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-934-5537_lg__14555.1558113429.500.750.jpg?v=1785329147","url":"https:\/\/www.goodvibesmarina.com\/products\/mercury-mariner-l6-ignition-coil-primary-wire-set-sierra-18-99328-inline-6-cylinder-outboard","provider":"Good Vibes Marina","version":"1.0","type":"link"}