{"product_id":"mercury-spark-plug-wires-84-8m0178258","title":"Mercury – Spark Plug Wires | V12 Verado \u0026 SeaPro Series | Marine-Grade | 8M0178258","description":"\u003ch2\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – Spark Plug Wires | V12 Verado \u0026amp; SeaPro Series | Marine-Grade | 8M0178258\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhen you run a big outboard — especially a V12 — you get used to relying on parts that \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ejust\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e work.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Spark plug wires might not be the first thing you think about when you push the throttles forward, but you definitely feel their influence every time the engine lights off clean, smooth, and strong. The Mercury 8M0178258 Spark Plug Wires \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eare built\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e with that exact kind of trust in mind. They give you the comfort of knowing every cylinder is firing exactly when it should, whether you’re idling through a quiet marina at sunrise or pushing offshore with a heavy load and a long run ahead.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDelivers dependable spark distribution to all twelve cylinders\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eMa\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003erine-grade construction built to withstand heat, vibration, and moisture\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eComplete replacement set with \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003etwelve spark plug wires\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eDesigned specifically\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for Mercury V12 ignition timing and coil placement\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDurable insulation resists breakdown from engine compartment temperatures\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThese Mercury Marine spark plug wires \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eare engineered\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMe\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ercury 7.6L V12 600hp Verado outboards\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury 7.6L V12 500hp SeaPro outboards\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIdeal for a wide range of larger vessels, including:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOffshore center consoles\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCommercial and patrol boats\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eBig multi-engine fishing rigs\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHigh-performance cruising platforms\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIf your boat relies on V12 power, these wires \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eare designed\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ewith\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e your setup \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ein mind\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eA V12 demands precision. Wi\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eth twelve cylinders firing in tight rhythm, the ignition system can’t afford even a slight misfire. These spark plug wires help maintain a steady, confident pulse throughout the entire powerband. You’ll notice the difference in how smoothly the engine starts, how evenly it idles, and how it pulls without hesitation when you roll into the \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ethrottles\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMe\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ercury builds these wires to handle the harsh realities of marine life — constant vibration, pounding chop, and a hot engine compartment that never completely cools off after shutdown. The insulation stays flexible, the ends \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003estay\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e tight, and the spark stays consistent. That reliability translates directly to better fuel efficiency, cleaner burns, and fewer surprises when you’re miles from the nearest dock.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eAnd the best part? Installation is straightforward. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEach wire is the correct length\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ewith the \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecorrect\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e boots, so you’ll get that clean, factory fit without having to wrestle anything into place.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWith something as critical as ignition, cutting corners isn’t worth the risk. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury’s spark plug wires \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ego through torture-testing\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e designed for marine extremes — not just general automotive use.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e That means:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eProper resistance and conductivity for V12 timing requirements\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eConfidence that each cylinder receives a consistent spark\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eLong-term durability in salt, heat, and constant motion\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eNo compatibility guesswork or premature failures\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe same performance Mercury intended when they engineered the engine\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOEM equals peace of mind, plain and simple.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which engines does this set fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e These spark plug wires fit Mercury 7.6L V12 600hp Verado and 500hp SeaPro outboards.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: How are these different from aftermarket wires?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e They’re built specifically for marine V12 demands — correct lengths, proper resistance, and materials tested for hot, wet engine compartments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I know this is the \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eright\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e replacement?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Match the part number and your engine model. If you’re running a Mercury V12, this set \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eis designed\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for your powerplant.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Are these safe for both freshwater and saltwater applications?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Absolutely. The insulation and connectors \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eare designed\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e to resist corrosion and moisture in all environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Can most boat owners install them themselves?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes. The wires are plug-and-play and \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003einstall using\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e basic tools. Just replace each wire one at a time to maintain correct routing.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935981130019,"sku":"84-8M0178258","price":663.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/8M0178258_Main.jpg?v=1760631455","url":"https:\/\/partsvu.com\/en-au\/products\/mercury-spark-plug-wires-84-8m0178258","provider":"PartsVu","version":"1.0","type":"link"}