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Mercury Mercruiser Ignition

Mercury Mercruiser Ignition

Make sure your Mercury MerCruiser sterndrive starts up reliably every time you turn the key by replacing your MerCruiser ignition components with genuine OEM Mercury replacement parts from PartsVu. Check out our complete list of MerCruiser Maintenance Parts Library.

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  • Mercury Mercruiser - Ignition Coil - Fits the F40/50/60 FourStroke Outboard & MCM 4.5L V6 - 300-8M0044991

    Mercury

    Mercury Mercruiser - Ignition Coil - Fits the F40/50/60 FourStroke Outboard & MCM 4.5L V6 - 300-8M0044991

    $84.66 $99.67
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  • Mercury Mercruiser - Spark Plug Wire Kit - Fits 2001-2015 MCM/MIE 5.0L, 5.7L & 6.2L MPI Engines with ECM 555 - 84-863656A1

    Mercury

    Mercury Mercruiser - Spark Plug Wire Kit - Fits 2001-2015 MCM/MIE 5.0L, 5.7L & 6.2L MPI Engines with ECM 555 - 84-863656A1

    (1)
    $132.49 $154.75
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  • Mercury Mercruiser - Cap and Rotor Kit - Fits MCM/MIE 5.0L, 5.7L & 6.2L MPI Engines with ECM 555 - 8M0061335

    Mercury

    Mercury Mercruiser - Cap and Rotor Kit - Fits MCM/MIE 5.0L, 5.7L & 6.2L MPI Engines with ECM 555 - 8M0061335

    $112.49 $131.33
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  • Mercury Mercruiser - Rotor - Fits 2001 and Newer MCM/MIE 4.3L, 5.0L, 5.7L & 6.2L MPI Engines with ECM 555 - 8M6001222

    Mercury

    Mercury Mercruiser - Rotor - Fits 2001 and Newer MCM/MIE 4.3L, 5.0L, 5.7L & 6.2L MPI Engines with ECM 555 - 8M6001222

    $19.29 $22.50
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  • Mercury Mercruiser - Distributor Cap - Fits 2001-2015 MCM/MIE 5.0L, 5.7L & 6.2L MPI Engines with ECM 555 - 8M6001106

    Mercury

    Mercury Mercruiser - Distributor Cap - Fits 2001-2015 MCM/MIE 5.0L, 5.7L & 6.2L MPI Engines with ECM 555 - 8M6001106

    (1)
    $86.36 $100.75
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  • Mercury Mercruiser - Cap and Rotor Kit - Fits GM V-8 Engines with Thunderbolt IV & V HEI Ignitions - 805759Q3

    Mercury

    Mercury Mercruiser - Cap and Rotor Kit - Fits GM V-8 Engines with Thunderbolt IV & V HEI Ignitions - 805759Q3

    $49.99 $58.58
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  • Mercury Mercruiser - Spark Plug Wire Kit - Blue - Fits GM V-6 262 CID Engines with Thunderbolt IV Ignition - 84-863656A04

    Mercury

    Mercury Mercruiser - Spark Plug Wire Kit - Blue - Fits GM V-6 262 CID Engines with Thunderbolt IV Ignition - 84-863656A04

    $86.07 $101.33
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  • Mercury Mercruiser - Ignition Coil - Fits GM V-6 & V-8 Engines with Thunderbolt IV & V Ignition - 300-8M0079202

    Mercury

    Mercury Mercruiser - Ignition Coil - Fits GM V-6 & V-8 Engines with Thunderbolt IV & V Ignition - 300-8M0079202

    (1)
    $104.99 $122.33
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  • Mercury Mercruiser - Distributor Cap - Fits GM V-8 Engines with Delco HEI Ignition, Except MPI Engines with ECM 555 - 808483T3

    Mercury

    Mercury Mercruiser - Distributor Cap - Fits GM V-8 Engines with Delco HEI Ignition, Except MPI Engines with ECM 555 - 808483T3

    $37.49 $44.00
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  • Mercury Mercruiser - Distributor Cap - Fits GM V-8 Engines with Thunderbolt IV & V HEI Ignitions - 805759T1

    Mercury

    Mercury Mercruiser - Distributor Cap - Fits GM V-8 Engines with Thunderbolt IV & V HEI Ignitions - 805759T1

    $53.99 $62.92
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  • Mercury Mercruiser - Cap and Rotor Kit - Fits GM V-8 Engines with Thunderbolt IV & V HEI Ignitions - 805759T3

    Mercury

    Mercury Mercruiser - Cap and Rotor Kit - Fits GM V-8 Engines with Thunderbolt IV & V HEI Ignitions - 805759T3

    (1)
    $49.99 $58.58
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  • Mercury Mercruiser - Spark Plug Wire Kit - Fits MCM 3.0L/LX with Delco EST Ignition - 84-816761Q14

    Mercury

    Mercury Mercruiser - Spark Plug Wire Kit - Fits MCM 3.0L/LX with Delco EST Ignition - 84-816761Q14

    $50.99 $59.33
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  • Mercury Mercruiser - Rotor - Fits GM V-8 Engines with Delco HEI Ignition - 8M6001253

    Mercury

    Mercury Mercruiser - Rotor - Fits GM V-8 Engines with Delco HEI Ignition - 8M6001253

    $12.10 $17.10
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  • Mercury Mercruiser - Rotor - Fits GM V-8 Engines with Thunderbolt IV & V Ignition - 13524T1

    Mercury

    Mercury Mercruiser - Rotor - Fits GM V-8 Engines with Thunderbolt IV & V Ignition - 13524T1

    $12.99 $17.90
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  • Mercury Mercruiser - Spark Plug Boot Kit - Fits Various O/B & MCM Applications - 85-63709A1

    Mercury

    Mercury Mercruiser - Spark Plug Boot Kit - Fits Various O/B & MCM Applications - 85-63709A1

    $5.59 $7.90
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  • Mercury Mercruiser - Rotor - Fits GM V-6 Engines with Thunderbolt IV & V HEI Ignition - 13524A6

    Mercury

    Mercury Mercruiser - Rotor - Fits GM V-6 Engines with Thunderbolt IV & V HEI Ignition - 13524A6

    $14.09 $19.90
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  • Mercury Mercruiser - Ignition Coil - Fits MCM 4 Cylinder V-6 & V-8 Engines with Conventional Ignition and some Outboard Applications - 898253T24

    Mercury

    Mercury Mercruiser - Ignition Coil - Fits MCM 4 Cylinder V-6 & V-8 Engines with Conventional Ignition and some Outboard Applications - 898253T24

    $61.72 $72.67
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  • Mercury Mercruiser - Distributor Cap - Fits GM V-6 Engines with Thunderbolt IV & V HEI Ignitions - 815407A2

    Mercury

    Mercury Mercruiser - Distributor Cap - Fits GM V-6 Engines with Thunderbolt IV & V HEI Ignitions - 815407A2

    $35.49 $41.33
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  • Mercury Mercruiser - Distributer Cap - Fits GM 4 Cylinder Engines with Delco Conventional Ignition - 393-9459Q1

    Mercury

    Mercury Mercruiser - Distributer Cap - Fits GM 4 Cylinder Engines with Delco Conventional Ignition - 393-9459Q1

    $26.49 $30.67
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  • Mercury Mercruiser - Ignition Module - Fits MCM/MIE 8.2L Engines with Thunderbolt IV Ignition - 805361T5

    Mercury

    Mercury Mercruiser - Ignition Module - Fits MCM/MIE 8.2L Engines with Thunderbolt IV Ignition - 805361T5

    $339.10 $401.75
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  • Mercury Mercruiser - Distributor Cap - Fits GM 4 Cylinder Engines with Delco EST Ignition - 811635T3

    Mercury

    Mercury Mercruiser - Distributor Cap - Fits GM 4 Cylinder Engines with Delco EST Ignition - 811635T3

    $13.49 $18.90
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  • Mercury Mercruiser - Cap and Rotor Kit - Fits GM 4 Cylinder Engines with Delco EST Ignition - 811635K2

    Mercury

    Mercury Mercruiser - Cap and Rotor Kit - Fits GM 4 Cylinder Engines with Delco EST Ignition - 811635K2

    $22.99 $26.58
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  • Mercury Mercruiser - Spark Plug Wire Kit - Red - Fits GM V-8 305/350/377 CID Engines with Mercury Ignition - 84-816608Q83

    Mercury

    Mercury Mercruiser - Spark Plug Wire Kit - Red - Fits GM V-8 305/350/377 CID Engines with Mercury Ignition - 84-816608Q83

    $88.99 $103.92
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  • Mercury Mercruiser - Spark Plug Wire Kit - Fits GM V-8 305*350 CID Engines with Thunderbolt IV and V Ignition - 84-816761Q17

    Mercury

    Mercury Mercruiser - Spark Plug Wire Kit - Fits GM V-8 305*350 CID Engines with Thunderbolt IV and V Ignition - 84-816761Q17

    $74.49 $87.00
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  • Mercury Mercruiser - Rotor - Fits GM 4 & 6 Cylinder Engines with Delco Conventional Ignition - 8M6001251

    Mercury

    Mercury Mercruiser - Rotor - Fits GM 4 & 6 Cylinder Engines with Delco Conventional Ignition - 8M6001251

    $4.46 $6.30
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  • Mercury Mercruiser - Rotor - Fits GM 4 Cylinder Engines with Delco EST Ignition - 8M6001254

    Mercury

    Mercury Mercruiser - Rotor - Fits GM 4 Cylinder Engines with Delco EST Ignition - 8M6001254

    $7.86 $11.10
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  • Mercury Mercruiser - Ignition Coil - Fits 2001 and Newer MCM/MIE 4.3L, 5.0L, 5.7L, & 6.2L MPI Engines with ECM 555 - 392-8M0054588

    Mercury

    Mercury Mercruiser - Ignition Coil - Fits 2001 and Newer MCM/MIE 4.3L, 5.0L, 5.7L, & 6.2L MPI Engines with ECM 555 - 392-8M0054588

    $379.12 $449.17
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  • Mercury Mercruiser - Spark Plug Wire Kit - Red - Fits GM V-8 350 & 454/502 CID Engines with Delco HEI Ignition - 84-816608Q68

    Mercury

    Mercury Mercruiser - Spark Plug Wire Kit - Red - Fits GM V-8 350 & 454/502 CID Engines with Delco HEI Ignition - 84-816608Q68

    $83.99 $98.17
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  • Mercury Mercruiser - Tune Up Kit - Fits GM In-Line 4 & 6 Cylinder Engines with Conventional Delco Ignition - 34235Q1

    Mercury

    Mercury Mercruiser - Tune Up Kit - Fits GM In-Line 4 & 6 Cylinder Engines with Conventional Delco Ignition - 34235Q1

    (1)
    $25.99 $30.50
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  • Mercury Mercruiser - Spark Plug Wire Kit - Fits MCM 496 Mag & HO and MIE 8.1L & HO - 84-8M0117678

    Mercury

    Mercury Mercruiser - Spark Plug Wire Kit - Fits MCM 496 Mag & HO and MIE 8.1L & HO - 84-8M0117678

    $545.90 $570.14
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  • Mercury Mercruiser - Spark Plug Wire Kit - Blue - Fits MCM 500 EFI & 575 SCi - 84-847701Q25

    Mercury

    Mercury Mercruiser - Spark Plug Wire Kit - Blue - Fits MCM 500 EFI & 575 SCi - 84-847701Q25

    $95.42 $112.33
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  • Mercury Mercruiser - Spark Plug Wire Kit - Blue - Fits GM V-8 305/350 CID Engines with Thunderbolt IV & V Ignition - 84-863656A05

    Mercury

    Mercury Mercruiser - Spark Plug Wire Kit - Blue - Fits GM V-8 305/350 CID Engines with Thunderbolt IV & V Ignition - 84-863656A05

    $108.01 $127.17
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  • Mercury Mercruiser - ICM Module - Fits MIE 5.7L Gen+ w/ Thunderbolt V Ignition - 861543T02

    Mercury

    Mercury Mercruiser - ICM Module - Fits MIE 5.7L Gen+ w/ Thunderbolt V Ignition - 861543T02

    $679.53 $709.71
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  • Mercury Mercruiser - Distributer Cap Gasket - Fits Thunderbolt IV & V Ignition - 27-805760

    Mercury

    Mercury Mercruiser - Distributer Cap Gasket - Fits Thunderbolt IV & V Ignition - 27-805760

    $3.68 $5.20
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  • Mercury Mercruiser - Cap and Rotor Kit - Fits GM V-6 Engines with Thunderbolt IV & V HEI Ignitions - 815407Q5

    Mercury

    Mercury Mercruiser - Cap and Rotor Kit - Fits GM V-6 Engines with Thunderbolt IV & V HEI Ignitions - 815407Q5

    $39.99 $46.75
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  • Mercury Mercruiser - Spark Plug Wire Set - Fits MCM 4.5L MPI - 84-8M0095475

    Mercury

    Mercury Mercruiser - Spark Plug Wire Set - Fits MCM 4.5L MPI - 84-8M0095475

    $106.17 $125.00
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Mercury MerCruiser Ignition Components Resources and Information

PartsVu is happy to stock a wide selection of certified Mercury MerCruiser electrical ignition components to fit the exact specifications of your engine. Whether you’re looking for MerCruiser Distributor Caps, Mercury MerCruiser Distributor Cap and Rotor Kits, and more, we have what you need to make sure your MerCruiser starts up like new every time.

For more information on MerCruiser ignition parts and how to perform DIY repairs for your entire engine, check out some of our helpful MerCruiser resources:

MerCruiser Electrical Ignition FAQs

How do I start my Mercury MerCruiser engine? 

In most cases, starting your Mercury Mercruiser motor only requires tilting the engine and turning the key. 

If this isn’t the case, you may need to troubleshoot which systems aren’t operating as required for a clean start before replacing your MerCruiser ignition control module. Here’s a few suggestions on where to start:

  1. Tilt the engine so that the fuel can more easily reach the carburetor (if your MerCruiser is equipped with fuel injection, tilting isn’t required but may help offset any other issues). 
  2. Squeeze the primer bulb a few times to enable fuel to circulate. Obstruction and contaminated fuel may impede the flow of gas from the fuel tank to the rest of the system.
  3. Check the battery connection and voltage level. Consider scrubbing the battery terminals for a more reliable connection and check for any short circuits. Replace any old batteries that don’t hold a reliable charge. Also, some batteries have an on/off switch. If this is true for your battery, make sure the switch is on. 
  4. Check all of your MerCruiser spark plugs. To do so, start by making sure there's an ignition spark with a spark gap tester. If you’ve got a good spark, make sure that the air gap is within specification. Adjust it if needed. If you have a good spark and the gap is within specification, the problem will likely not be found in the ignition system.Clean and adjust the spark plugs, replacing any with darkened metal contacts that no longer spark reliably. 
  5. If the kill switch isn’t properly attached it could very well be the source of your motor problems. Undo the connection and put it right back into place. The kill switch may need to be replaced altogether.
  6. Check your gear shift, as it is easy to knock out of place, preventing the engine from starting. Make sure that you’re in neutral and try starting your engine once more.
  7. It may sound obvious, but check for any gas in your fuel tank. This is more common than most boaters think, as a closed vent prevents air from replacing fuel as the motor pulls it out, which is necessary for firing up the engine. On the other hand, an open tank vent can promote evaporation of fuel during storage. 
  8. Sometimes, the issues may simply be that your engine propeller has something tangled around it. This may be fishing line, excessive seaweed, or some other material that’s worked its way around the blades. Carefully remove anything that may be wrapped around the propeller, and give it a once-over for any damage that may be present. If the propeller is damaged, it needs to be replaced. Debris around the propeller is the most likely culprit if your boat motor starts, but quickly dies.
  9. Pay attention to any anomalies when you last operated your engine. For example, a bogged down engine can indicate failing spark plugs, obstructions in the fuel lines, water infiltration via the head gasket, and more. If you can’t source the issue, consider taking it to a certified Mercury MerCruiser dealer for a full evaluation.

How do I check the hours on my Mercury outboard motor?

Mercury MerCruiser engines are designed with exacting specifications that predictably begin to fail during predetermined time periods. While you should always be keeping track of your engine hours, having an authorized Mercury outboard dealer access your Mercury MerCruiser’s computer memory for a complete diagnostic check about hours of use and other useful data.

A dealer might charge you for 30 minutes or so of labor to run a diagnostic scan, but if you are buying a used Mercury outboard motor, this investment is well worth it. However, if you are negotiating to buy the motor from a certified dealer, the dealer should provide a diagnostics report for no charge.

How often should I change my MerCruiser engine spark plugs?

Most marine mechanics and experienced boaters agree that frequent replacement of spark plugs is absolutely essential for electrical ignitions on MerCruisers. Some boaters are adamant about changing their spark plugs when they break out their boats for the season, while others change their spark plugs every 100 hours. PartsVu recommends regularly inspecting your spark plugs every 100 hours during service intervals, replacing them if they are fouled or damaged, and ALWAYS replacing them every 300 hours (or every 3 years, whichever comes first).

How many hours will my MerCruiser last?

In truth, most well-maintained MerCruiser engines will last anywhere between 5,000 - 12,000 hours - which is why you’ll see MerCruiser engines used in thousands of commercial and recreational boats out on the water . 

Why the wide variance between operational hours? These hours are highly dependent on how much maintenance you’re willing to put into the engine (observing each 100-hour and 300-hour service intervals), what type of use the engine endures (ie. operating under heavy loads or high RPMs for extended periods), and how well the engine is winterized

For example, if a Mercury outboard experiences long periods of wide-open throttle, extended periods of trolling, or load weight is commonly higher than recommended, service intervals need to be more frequent, and overall engine life will likely be shorter.

Similarly, improper storage can wreak havoc on your MerCruiser electrical ignition systems. Moisture infiltration corrodes electrical components, where once-reliable electronic ignition systems don’t work at all until all corrosion is removed and all affected components are replaced (including ignition coils and spark plug wires). Improper storage may also enable pests to nest in your engine, where organic matter offsets proper ignition voltages or even small animals may chew wires.