Mercury – Quicksilver 816761Q9 Spark Plug Wire Kit | V8 MerCruiser Engines (Ford & GM) | Points & Thunderbolt Ignition | 816761Q9

Overview

Reliable spark makes all the difference in how your boat performs. The Quicksilver 816761Q9 Spark Plug Wire Kit keeps classic V8 MerCruiser engines — built by Ford or General Motors — running strong and smooth. Designed for points ignition systems (1963–1982) and Thunderbolt ignition systems (1968–1976), this OEM wire set restores the clean, consistent ignition these engines were known for.

Each wire is precision-cut for perfect routing and finished with molded boots that seal tight against water and corrosion. It’s built to Mercury’s standards for endurance, flexibility, and long-term marine reliability — the right fix for engines that have earned their keep.

Key Features

• Purpose: Restores clean, consistent spark for smoother starts and better throttle response.
• Fitment: Fits V8 MerCruiser engines by Ford or GM with points (1963–1982) or Thunderbolt (1968–1976) ignition systems.
• Kit Contents: Complete set of eight spark plug wires with molded plug-end boots.
• Design: Each wire is factory-length to reach the correct plug location with a clean fit.
• Durability: Built for marine-grade heat, vibration, and moisture resistance.

Engine & Boat Compatibility

• Ford and GM-based V8 MerCruiser engines (1963–1982)
• Points and early Thunderbolt ignition systems
• Common on vintage cruisers, classic ski boats, and early sterndrive models

Performance & Practical Benefits

Old or cracked plug wires can sap your engine’s power and reliability. The 816761Q9 kit restores solid spark energy across all eight cylinders, helping your engine fire up quicker, idle smoother, and run cleaner under load.

Each wire’s core is designed for efficient voltage transfer, while the marine-grade insulation prevents arcing or shorting in damp conditions. The molded boots seal tightly to keep moisture and salt out, extending the life of your ignition system. Once installed, you’ll notice steadier throttle response and more dependable performance across every run.

Why Buy OEM

Mercury’s OEM wires are made for marine use — built to withstand the elements that car parts can’t handle. Every Quicksilver set is tested for exact fit, proper resistance, and flexibility to survive years of heat and vibration.

Aftermarket wires might look the same, but they often miss on key details like length, resistance, or insulation quality. With genuine Quicksilver wires, you get the fit and dependability your classic MerCruiser was built for — no trimming, no guesswork, just plug-and-go confidence.

FAQ

Q1: What engines fit the Quicksilver 816761Q9 kit?
A: It’s made for V8 MerCruiser engines built by Ford or GM, using points (1963–1982) or Thunderbolt (1968–1976) ignition systems.

Q2: How many wires are included?
A: The kit comes with eight spark plug wires, each pre-fitted with molded boots.

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

Q4: How easy is installation?
A: Simple — just replace one wire at a time to keep the firing order correct. No special tools required.

Q5: Why OEM instead of aftermarket?
A: OEM wires offer perfect fit, better spark stability, and longer life in marine conditions. Aftermarket sets can’t match that reliability.