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Mercruiser Ignition System

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Parts Selection Guide

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      • Champion QL77JC4 Spark Plug
        List Price: $4.37
        Now: $3.06

        Champion QL77JC4 Marine Spark Plug Champion marine spark plugs are quality OEM replacements. The Champion QL77JC4 Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark...

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      • Champion RS12YC Spark Plug
        List Price: $5.38
        Starting At: $3.77

        Champion RS12YC Copper Plus Marine Spark Plugs Champion marine spark plugs are quality OEM replacements. The Champion RS12YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These...

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      • Champion RV15YC4 Spark Plug
        List Price: $5.38
        Starting At: $3.77

        Champion RV15YC4 Copper Plus Marine Spark Plug Champion marine spark plugs are quality OEM replacements. The Champion RV15YC4 Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These...

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      • Sierra 18-5273 Tune Up Kit Replaces 805759Q3
        List Price: $46.49
        Starting At: $29.95

        Sierra 18-5273 Mercruiser Tune Up Kit for V8 Thunderbolt HEI Ignitions  Sierra high-quality engine parts are designed to meet OEM specifications. Fits GM V-8 engines with Thunderbolt IV & V HEI ignitions. Voltage Regulator 18-5710 Kit...

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      • List Price: $4.49
        Starting At: $1.34

        Sierra 18-5226 Ignition Wire (Hypalon) - Per Foot Sierra high-quality ignition wire. Sold by the foot. Material: Metallic Core Wire: 7mm Hypalon Interchangeable with: Johnson/Evinrude Outboard 772584 510883

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      • Sierra 18-5268 Tune Up Kit
        List Price: $38.99
        Starting At: $26.23

        Tune Up Kit - Delco In-line 4 Single Point For marine engines with Delco In-Line 4 - Single Point distributors Used on Mercruiser, OMC, Crusader and Chris Craft Marine engines. Kit Includes: Contact Set 18-5311 Condenser 18-5345 Rotor 18-5418...

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      • Sierra 18-5438 Ignition Coil Replaces 300-8M0079202
        List Price: $54.49
        Starting At: $38.49

        Ignition Coil for Thunderbolt Mercruiser & Crusader Ignitions Replaces: Crusader 37068 Mercury 392-805570A2, 392-7803A4, 392-7803, 3000-8M0079202, 392-805570A1 Mallory 9-29701 GLM 72115 Pro Marine 64570 Redline RL5438  

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      • Sierra 18-8800-1 Wiring Plug Set Replaces 84-816761Q5
        List Price: $40.99
        Starting At: $29.05

        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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      • NGK BPR6FS Spark Plug
        List Price: $3.09
        Now: $2.16

        NGK BPR6FS Spark Plug Designed to operate over a much wider heat range than ordinary plugs Resists carbon buildup and pre-ignition High alumina ceramics for better heat transfer and electrical insulation Solid copper core and nickel tipped...

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      • 894911
        List Price: $4.74
        Starting At: $3.95

        Key 1A , Mercury - Mercruiser 89491-1 Replacement ignition key Priced individually

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      • Sierra 18-8810-1 Wiring Plug Set Replaces 84-816761Q16
        List Price: $51.99
        Starting At: $36.49

        Mercruiser Thunderbolt V6 Spark Plug Wire Set by Sierra For 6 cylinder engines with Thunderbolt ignition systems. Kit includes coil wire. Kevlar® core for maximum durability and long life. Durable stainless steel wound conductor for maximum...

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      • Sierra 18-5280 Tune Up Kit Replaces 811635Q2
        List Price: $16.99
        Starting At: $12.08

        Sierra 18-5280 Tune Up Kit for Mercruiser and OMC Stern Drives Sierra high-quality replacement parts are designed to meet OEM specifications.  In-Line 4 Delco EST Kit Includes: (1) 18-5361 Distributor Cap (1) 18-5406...

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      • Sierra 18-5433 Ignition Coil Replaces 898253T24
        List Price: $48.99
        Starting At: $36.99

        Ignition Coil - Delco Ignitions All engines that use Points and Condenser Distributors Product Details: Use with: High Performance Ignition Coil: 18-5469 For Universal: Atomic Four, Super Sabre Fits: 3.0L (1991 & Up) 5.7 EFI (1996 & Up) 7.4L...

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      • List Price: $2.96
        Now: $2.07

        Champion RV91MC Marine Spark Plug Champion marine spark plugs are quality OEM replacements. The Champion RV91MC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark...

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      • Sierra 18-5275 Tune Up Kit
        List Price: $47.49
        Starting At: $35.22

        Tune Up Kit - Prestolite V8 Single Point Screw Cap For marine V8 engines that use a Prestolite Distributor with a Single Point, Screw Down Cap. Used on Christ Craft, Crusader, Indmar, Pleasurecraft, Mercruiser and OMC marine engines. Kit Includes: ...

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      • Sierra 18-5274 Tune Up Kit
        List Price: $36.49
        Starting At: $22.45

        Mercruiser Tune Up Kit for V6 Thunderbolt HEI Ignitions Kit Includes: Rotor 18-5432 Distributor Cap 18-5396 Gasket  Replaces: Mercury 815407Q 5, 815407T5 Pro...

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      • Sierra 18-5750 Universal Spark Plug Boot Replaces 0580339
        List Price: $4.99
        Starting At: $2.81

        Sierra 18-5750 Universal Spark Plug Boot Supplied complete with Terminal Connector. Interchangeable with: GLM 74000 Johnson/Evinrude Outboard 581027 580339 Mallory 9-28124 OMC Stern Drive 580339 581027  

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      Mercruiser Ignition Tune Up

      The condition of your Mercruiser ignition system is critical to its performance. Over time your outboard’s electrical components can be effected by wear, corrosion or system leaks. A faulty ignition can scuttle a planned outing on the water, and possibly require an expensive repair. When your Mercruiser is hard to start or will not start, Wholesale Marine offers these suggestions for troubleshooting your ignition system. This procedure enables owners to fault trace if it requires a simple fix or a significant repair.

      When it’s Time to Tune Up Your Mercruiser Ignition System

      1)    First, check the obvious. Is there plenty of gas in the tank? Are all the fluids at the correct levels? Lastly, make sure all the wires are corrosion-free and connected properly. Try to start the engine. A quick fix may be all that it required.

      2)    If there is no start from the engine, a faulty or worn spark plug may be the culprit. Pull the plug and ensure that it is clean. If it is wet, this may be an indication of a bigger issue. If the plug is dry but discolored, it may have been the wrong type of plug for your motor. Check your owner’s manual and install the right plug.

      3)    If the plug is working disconnect the black/yellow wire from the engine to check the kill circuit. If the engine still does not start, the white/green and green/white stator wires need to be replaced. This will impact the engine starting cylinder. If the engine still will not start, the stator is bad and requires replacement.

      When it is time to troubleshoot or tune-up your Mercruiser ignition system, know that Wholesale Marine has everything you need. We offer a competitive pricing guarantee and most items flat rate ship the same day. Returns are stress free and we welcome your questions. Make us your one-stop boating shop! Join ourLoyalty Program and use the points toward any future purchases. We’re here to take your call Monday through Friday from 9:00 AM until 6:00 PM EST at (877) 388-2628.