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      • Sierra 18-8800-1 Wiring Plug Set Replaces 84-816761Q5
        $52.49
        $36.99

        Premium 4cyl Spark Plug Wire Set by Sierra For 4 cylinder engines with conventional ignition systems. Used on Mercruiser and OMC 2.5L and 3.0L marine engines. Kit includes coil wire. Kevlar® core for maximum durability and long life. Durable...

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      • Sierra 18-8828-1 Wiring Plug Set Replaces 84-863656A1
        $133.99
        $93.99

        Sierra 18-8828-1 Wiring Plug Set For Mercruiser 5.0L MIE MPI V8 with Delco HEI ignition system. Sierra replacement engine parts are manufactured to meet or exceed OEM requirements. Ignition Type: Delco HEI Wire Lengths: (2) Spark Plug Wires...

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      • Sierra 18-8801-1 Wiring Plug Set Replaces 84-816761Q7
        $77.49
        $58.99

        Sierra 18-8801-1 Premium 6 Cyl. Spark Plug Wire Set For 6 cylinder GM based engines with conventional ignition systems. Features: Kit includes coil wire. Kevlar core for maximum durability and long life. Durable stainless steel wound conductor for...

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      • Sierra 18-8811-1 Wiring Plug Set Replaces 84-816761Q13
        $56.99
        $42.99

        Sierra 18-8811-1 Wiring Plug Set For all 4 Cyl. engines with a digital ignition system. Used on Mercruiser and OMC marine engines. Kit includes 5 wires. Key Features: Kevlar core for maximum durability and long life Durable stainless steel wound...

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      • Mercruiser 84-816761Q14 Spark Plug Wiring Kit
        $87.99
        $55.49

        Quicksilver 816761Q14 Spark Plug Wire Kit for MerCruiser with Delco EST -1990–2016 Quicksilver Spark plug wire kit for MerCruiser 3.0L and LX engines equipped with Delco EST ignition systems (1990–2016). Includes a complete set of wires with...

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      • Sierra 18-8822-1 Spark Plug Wire Set
        $112.99
        $78.99

        Sierra 18-8822-1 Spark Plug Wire Set Sierra replacement spark plug wire set for Delco HEI engines. Ignition Type: Delco HEI Wire Lengths: 2 Spark Plug Wires 27.5" 2 Spark Plug Wires 30.5" 2 Spark Plug Wires 39" 2 Spark Plug Wires 41" 1 Coil...

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      • Sierra 18-8829-1 Wiring Plug Set Replaces 84-863656A2
        $132.99
        $107.99

        Sierra 18-8829-1 Mercruiser HEI V6 Spark Plug Wire Set For Mercruiser 4.3L MPI with Delco HEI ignition. Sierra replacement engine parts are manufactured to meet or exceed OEM requirements. Interchangeable with: Mallory 9-28057 Mercury...

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      • EMP 84-28009 MerCruiser Ignition Wire Set
        $95.99
        $79.99

        EMP 84-28009 MerCruiser Ignition Wire Set This ignition wire set is intended for use with MerCruiser, Indmar, Crusader engines and meets all OEM requirements. These cables features a inner Kevlar core to help eliminate breakage. A layered carbon...

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      • Mercruiser 84-816761Q-9 Spark Plug Wire Kit
        $120.99
        $105.49

        Mercruiser 84-816761Q-9 Spark Plug Wire Kit Genuine OEM Mercury - Mercruiser part. Fits: GM & Ford V‑8 engines w/ conventional points ignition (1963‑1982) and Thunderbolt ignition (1968‑1976) Special Order Item.

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      Mercruiser OEM Engine Parts Finder

      MerCruiser Spark Plugs Wires

      Over time, salt spray, humidity, and UV rays take their toll on many boat systems, even those that are not readily visible. That is why it is so important to routinely check your Mercruiser spark plugs, wires, and wiring harness for signs that its service life is over. If your plugs are pitted and your engine performance has diminished, their replacement is a no-brainer. With wiring it is a bit harder to tell.

      There are two schools of thought here. Those boaters who push the envelope and replace their Mercruiser sparks and wiring only when one or both fail, and those who watch their engine hours and replace each according to their manufacturer’s recommendations.

      Need Help Selecting the Right Mercruiser Spark Plugs/Wires?

      Whichever type of boater you are, know that when your Mercruiser spark plugs and wires are in need of replacement that you’ll find just what you need, and receive it just as quickly. Wholesale stocks a wide range of wiring harnesses by Sierra a name boaters trust. If you’re not certain exactly what part you’ll need, you have two options.

      Be sure to use our convenient parts selector to find just the right Mercruiser spark plugs and wires for your engine. If you’d prefer, speak with one of our knowledgeable representatives. We’re here to serve you Monday through Friday from 9:00 AM until 6:00 PM EST at (877) 388-2628. For even greater savings, don’t forget to ask us about our Captain’s Club Rewards Program. This way you’ll accrue points you can redeem the very next time you shop at Wholesale Marine!