Mercury – Quicksilver Blue Wire Spark Plug Wire Kit | V8 Inboard Ignition System | Marine Grade | 847701Q25

Overview

The Quicksilver 847701Q25 Blue Wire Spark Plug Wire Kit is made for V8 MerCruiser 500 EFI (1998–2004) and 575 SCi (2000–2005) engines—two powerhouses that need reliable spark delivery every time. This OEM kit from Mercury Marine comes ready to install with factory-length blue wires and heavy-duty boots already attached. Each wire is built to handle heat, moisture, and vibration, giving your high-performance motor the steady ignition it needs to run clean and strong out on the water.

Key Features

• Purpose: Sends consistent spark to each plug for smooth starts and dependable ignition under load.
• Material: Made with thick marine-grade silicone that resists heat, cracking, and saltwater corrosion.
• Performance: Keeps voltage steady for crisp throttle response, efficient fuel burn, and fewer misfires.
• Design: Each wire is cut to the exact factory length and fitted with tight, weatherproof boots.
• Ease of Use/Install: Direct replacement—no trimming or adjustments. Just plug them in and go.

Compatibility

• Engines:
• MerCruiser 500 EFI (1998–2004)
• MerCruiser 575 SCi (2000–2005)
• Engine Type: V8 Inboard Marine
• Common Boats: Offshore Performance Boats | Sport Cruisers | Classic Muscle Boats | High-Output Inboards

Performance & Real-World Benefits

This wire set helps your big-block MerCruiser stay strong and consistent, even when you’re pushing it hard. You’ll notice smoother idle, faster starts, and cleaner acceleration. The insulation stands up to the punishing heat of marine engine bays while keeping out moisture and corrosion. It’s the kind of small upgrade that keeps your boat dependable weekend after weekend—and that peace of mind matters when you’re far from shore.

Why Choose OEM

When you use Mercury Marine OEM parts, you’re not guessing—you’re getting the exact fit and performance your engine was built for. OEM wires are tested for voltage balance, heat resistance, and flexibility in harsh marine conditions. Aftermarket sets might work at first, but they rarely hold up long term. With Quicksilver, you get precision, durability, and the same quality that Mercury installs at the factory—no surprises, just performance.

FAQ

Q1: Which engines does this kit fit?
It’s built for MerCruiser 500 EFI (1998–2004) and 575 SCi (2000–2005) V8 engines.

Q2: Are the wires ready to install?
Yes. They’re factory-length with pre-fitted boots—just swap them in and you’re done.

Q3: Can they handle saltwater and high heat?
Absolutely. They’re made for tough marine use and hold up well in hot, humid conditions.

Q4: Will I notice a performance difference?
Most boaters do—faster starts, cleaner running, and fewer misses under throttle.

Q5: How many wires are in the kit?
It’s a complete eight-wire set, one for each cylinder.