Mercury – Spark Plug Wire Kit | Ignition System | Marine-Grade Construction | 863656A03

Overview

There is something reassuring about turning the key and hearing your engine fire cleanly on the first crank. When you spend your weekends around tow boats, wake boats, and other vessels built to haul friends and gear across the water, you learn quickly that ignition quality is everything. A good set of spark plug wires does more than carry current—they set the tone for every ride. This Mercury Marine part brings back that reliable snap you can feel, the kind that makes you trust your engine whether you are pulling a rider out of the hole or cruising across a glassy lake at sunrise.

Key Features

• Complete spark plug wire kit with molded boots at the plug end
• Marine-grade wire construction designed for heat, vibration, and moisture
• Proper wire lengths tailored specifically for Black Scorpion V8 and MX 6.2L engines
• Engineered for strong, consistent spark delivery
• Designed to maintain correct firing order and smooth ignition timing
• Built to Mercury Marine’s original equipment specifications

Engine & Boat Compatibility

• Fits V8 MerCruiser Black Scorpion engines
• Compatible with MX 6.2L Black Scorpion Tow Sports engines
• Designed for engines within serial range 0M391599–2A460164
• Common on ski boats, wake boats, tow-sports models, runabouts, and performance inboard setups

Performance & Practical Benefits

On the water, ignition issues do not creep up gradually—they hit fast, usually at the worst possible moment. Swapping in this genuine Mercury spark plug wire kit restores that clean, steady ignition tone you want to hear every time the engine comes to life. You will notice the difference right away: the idle settles into a quiet, predictable rhythm, throttle response feels quicker, and the engine pulls more smoothly under load.

The boots seat tightly around the plugs, giving you that reassuring “locked-in” feel. The wires bend where they should, stay put under vibration, and do not fight you during routing. Once installed, they simply disappear into the engine—no drama, no loose connections, no mixed lengths that force you to stretch or pinch a wire to make it fit.

The marine-grade insulation is thick and confident in your hands, built to shrug off heat from the manifolds, moisture from the bilge, and the constant shaking that comes with tow-sports running. These wires are designed for real-world use, not showroom simplicity, and that shows every time you fire up the engine after a long day on the water.

Why Buy OEM

Boaters who have been around a while know that ignition components are not worth cutting corners on. With OEM Mercury Marine parts, you get:

• The correct length for every wire, guaranteed
• Consistent spark output engineered for your specific engine
• Better durability than most aftermarket options
• Reduced risk of misfires and electrical noise
• A part designed to fit right the first time, without improvisation

When you choose genuine Mercury Marine quality, you are choosing long-term reliability, fewer troubleshooting headaches, and a better-running engine overall.

FAQ

Q1: Which engines does the Spark Plug Wire Kit 863656A03 fit?

It fits V8 MerCruiser Black Scorpion and MX 6.2L Black Scorpion Tow Sports engines.

Q2: What makes this kit better than aftermarket wires?

The lengths, boots, and internal construction are engineered specifically for these engines, ensuring proper fit and a consistent, strong spark.

Q3: How can I confirm this is the right kit for my boat?

Match your engine model and serial range (0M391599–2A460164) with your owner’s manual.

Q4: Is this kit suited for both saltwater and freshwater environments?

Yes—its marine-grade insulation is designed for reliable performance in either environment.

Q5: Is installation straightforward?

Absolutely. If you can follow the firing order and route wires cleanly, installation is simple for most owners.