{"product_id":"premium-marine-spark-plug-wire-set-47-88291","title":"Sierra Premium Marine Spark Plug Wire Set – 47-88291 | MerCruiser Thunderbolt","description":"\u003ch2\u003eSierra Premium Marine Spark Plug Wire Set – MerCruiser Thunderbolt Ignition\u003c\/h2\u003e\u003cp\u003eRestore reliable ignition performance to your MerCruiser with this premium spark plug wire set engineered for Thunderbolt ignition systems. Over time, heat cycling, vibration, and moisture cause plug wire insulation to crack and resistance to rise — leading to misfires, rough idle, and reduced power. This Sierra set replaces worn wires with marine-grade materials built to deliver consistent, high-voltage spark in demanding on-water conditions.\u003c\/p\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser engines equipped with Thunderbolt ignition systems\u003c\/li\u003e\n\u003cli\u003eRefer to Sierra part number 47-88291 application guide for specific engine models and years\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eKevlar® core\u003c\/strong\u003e — maximum durability and long service life under continuous vibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless steel wound conductor\u003c\/strong\u003e — optimized for maximum horsepower and consistent engine performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium silicone jacketing and boots\u003c\/strong\u003e — high-temperature protection against engine bay heat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior RFI suppression\u003c\/strong\u003e — shields sensitive onboard electronics from ignition interference\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-resistant stainless steel terminals\u003c\/strong\u003e — at both spark plug and distributor ends for maximum conductivity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOE-style sealed boots\u003c\/strong\u003e — barrier against heat, dirt, and moisture intrusion\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication-specific magnetic suppression core\u003c\/strong\u003e — precision fit for your engine configuration\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 47-88291\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition Type:\u003c\/strong\u003e Thunderbolt (MerCruiser)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eComplete Your Ignition Service\u003c\/h3\u003e\u003cp\u003eFor a full tune-up, pair these wires with a matching distributor cap and rotor from our \u003ca href=\"\/collections\/ignition-components\"\u003eIgnition Components\u003c\/a\u003e collection. Need a different fitment? Also consider the \u003ca href=\"\/products\/sierra-premium-marine-spark-plug-wire-set-47-88021-mercruiser-thunderbolt\"\u003eSierra Wire Set – 47-88021\u003c\/a\u003e, \u003ca href=\"\/products\/sierra-premium-marine-spark-plug-wire-set-47-88032-mercruiser-thunderbolt\"\u003e47-88032\u003c\/a\u003e, \u003ca href=\"\/products\/sierra-premium-marine-spark-plug-wire-set-47-88041-mercruiser-thunderbolt\"\u003e47-88041\u003c\/a\u003e, \u003ca href=\"\/products\/sierra-premium-marine-spark-plug-wire-set-47-88071-mercruiser-thunderbolt\"\u003e47-88071\u003c\/a\u003e, \u003ca href=\"\/products\/sierra-premium-marine-spark-plug-wire-set-47-88101-mercruiser-thunderbolt\"\u003e47-88101\u003c\/a\u003e, \u003ca href=\"\/products\/sierra-premium-marine-spark-plug-wire-set-47-88111-mercruiser-thunderbolt\"\u003e47-88111\u003c\/a\u003e, \u003ca href=\"\/products\/sierra-premium-marine-spark-plug-wire-set-47-88201-mercruiser-thunderbolt\"\u003e47-88201\u003c\/a\u003e, \u003ca href=\"\/products\/sierra-premium-marine-spark-plug-wire-set-47-88211-mercruiser-thunderbolt\"\u003e47-88211\u003c\/a\u003e, \u003ca href=\"\/products\/sierra-premium-marine-spark-plug-wire-set-47-88221-mercruiser-thunderbolt\"\u003e47-88221\u003c\/a\u003e, or \u003ca href=\"\/products\/sierra-premium-marine-spark-plug-wire-set-47-88281-mercruiser-thunderbolt\"\u003e47-88281\u003c\/a\u003e. Need a single replacement lead? See the \u003ca href=\"\/products\/premium-marine-spark-plug-wire-6-47-88161\"\u003eSierra 6\" Spark Plug Wire – 47-88161\u003c\/a\u003e.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThe 47-88291 is a premium-tier set in this Thunderbolt wire family — priced similarly to the 47-88281 but at a lighter 626g, which points to a specialized engine configuration with a different lead layout rather than a larger cylinder count. It’s the right choice when a Thunderbolt-equipped MerCruiser is misfiring under load, idling roughly, or showing intermittent spark after spark plugs have already been ruled out. As always, replace the full set at once to maintain consistent resistance across all cylinders, and confirm your engine model and year against the Sierra 47-88291 application guide before ordering — fitment is engine-configuration-specific.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250811306020,"sku":"47-88291","price":216.29,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-88371_155bee71-3023-40d5-92ad-7bca95667744.jpg?v=1786510568","url":"https:\/\/marisolmarine.com\/products\/premium-marine-spark-plug-wire-set-47-88291","provider":"Marisol Marine Company","version":"1.0","type":"link"}