Mercury – Quicksilver 816761Q16 Spark Plug Wire Kit | V6 MerCruiser Engines | Thunderbolt IV Ignition | 816761Q16

Overview

Smooth, reliable ignition is what keeps your boat running like it should. The Quicksilver 816761Q16 Spark Plug Wire Kit brings your V6 MerCruiser engine (1985–2003) back to that factory-fresh performance. Built for Thunderbolt IV ignition systems, this OEM wire set restores clean spark delivery, steady idle, and quick starts — everything you need for dependable days on the water.

Each wire is precision-cut for your engine’s exact layout and fitted with molded boots that lock tightly to the plugs, keeping moisture out and spark energy in. It’s a simple replacement that pays off with smoother running and long-term durability.

Key Features

• Purpose: Replaces worn or corroded plug wires to restore full ignition performance.
• Fitment: Designed for V6 MerCruiser engines (1985–2003) with Thunderbolt IV ignition systems.
• Kit Contents: Complete set of spark plug wires with molded plug-end boots for secure connection.
• Design: Each wire is custom-length for proper fit and clean routing.
• Marine Durability: Built to handle heat, vibration, and moisture found in marine environments.

Engine & Boat Compatibility

• V6 MerCruiser inboard and sterndrive engines (1985–2003)
• Thunderbolt IV ignition systems
• Common on family cruisers, sport boats, and mid-size runabouts

Performance & Practical Benefits

The 816761Q16 wire kit delivers strong, consistent voltage to every plug, helping your engine start faster, idle smoother, and accelerate more cleanly. The low-resistance cores ensure each cylinder fires evenly, while the marine-rated insulation protects against heat, salt, and engine-bay vibration.

You’ll notice immediate improvements in throttle response and overall reliability. Installation is straightforward — just replace one wire at a time to maintain the correct firing order. Once in place, you’ll have years of dependable spark and confident performance.

Why Buy OEM

Mercury’s OEM wires are built specifically for marine use — with the right resistance, perfect length, and materials that hold up to the heat and moisture of life on the water. Aftermarket wires might look similar but can vary in size or resistance, leading to weak spark or misfires.

With Quicksilver OEM wires, you get the exact fit and dependable ignition your engine was designed for. They’re proven in the same conditions your boat faces every trip.

FAQ

Q1: What engines use the Quicksilver 816761Q16 kit?
A: It fits V6 MerCruiser engines (1985–2003) equipped with Thunderbolt IV ignition systems.

Q2: How many wires are included?
A: A complete set of spark plug wires — one for each plug, all with molded ends.

Q3: Can these wires handle saltwater?
A: Yes. They’re made with corrosion-resistant materials for both salt and freshwater use.

Q4: Are they easy to install?
A: Very. Each wire is pre-cut to length — just replace them one by one and you’re done.

Q5: Why choose OEM?
A: OEM wires guarantee a perfect fit, longer lifespan, and factory-level performance that aftermarket sets can’t match.