MERCURY SPARK PLUG WIRE 5

Function and technical context

The spark plug wire is the component responsible for conducting high-voltage electrical voltage from the ignition coil to the spark plug electrodes in 5-inch Mercury Mariner engines. This cable is part of the ignition system, being essential to produce the necessary spark jump in the combustion chamber. A poor or damaged spark plug wire prevents efficient combustion, causing misfires, loss of power during acceleration and difficulties in starting, especially in conditions of high marine humidity.

When to replace this part?

Spark plug wires require periodic inspection at every seasonal maintenance, especially in marine salinity environments where corrosion and moisture accelerate insulation deterioration. Symptoms of failure include visible sparking in the cable when the engine is running, intermittent misfires, excessive fuel consumption, and difficulty maintaining stable revs. Preventive replacement of the spark plug wire is a low-cost operation that avoids more complex repairs to the ignition system and ensures reliable operation while sailing.

Equivalent manufacturer part numbers