Mercury – Quicksilver 816608Q83 Red Wire Spark Plug Wire Kit | V8 GM MerCruiser Engines (305, 350, 377 CID) | Mercury Ignition | 816608Q83

Overview

Good spark is what keeps your boat running smooth and strong. The Quicksilver 816608Q83 Red Wire Spark Plug Wire Kit is built for V8 GM-based MerCruiser engines (305, 350, and 377 CID) that use Mercury ignition systems (1999–2001).

Each wire is cut to the exact length for your setup, with molded boots that fit snug and seal out moisture. The red jacket looks clean under the cowl, but it’s more than just color — it’s made from heat-resistant, marine-grade insulation that stands up to salt, vibration, and long days on the water.

Key Features

• Purpose: Replaces worn or weak plug wires to bring back strong, even spark.
• Fitment: Designed for V8 GM MerCruiser engines (305, 350, 377 CID) with Mercury ignition (1999–2001).
• Kit Includes: Eight red wires with molded plug boots, each cut to factory-correct length.
• Durability: Marine-rated construction that resists heat, oil, and corrosion.
• Performance: Delivers consistent voltage and keeps spark energy steady through all RPM ranges.

Engine & Boat Compatibility

• GM-based MerCruiser V8 engines (305, 350, 377 CID)
• Mercury ignition systems, model years 1999–2001
• Common in inboards, tow-sports boats, and mid-size cruisers

Performance & Practical Benefits

A fresh wire set can do more for your engine than you think. The 816608Q83 restores clean spark delivery across all cylinders, helping your motor fire instantly and run smoother under load. You’ll feel crisper throttle response and a stronger pull when it counts.

The heavy-duty insulation stays flexible even in hot engine bays, while the snug boots keep out water and corrosion. Because every wire is the right length from the factory, routing is neat and simple — replace one at a time and you’re back on the water in no time.

Why Buy OEM

Mercury builds their ignition parts for life on the water — constant heat, vibration, and exposure that most aftermarket brands never test for. The OEM wires are made with the right resistance, proper core materials, and perfectly molded ends to fit your engine the way it should.

Aftermarket wires might look close, but they can be off by an inch or two in length or lose insulation strength after a season. Quicksilver OEM gives you peace of mind: perfect fit, proven durability, and the same quality that came with your engine when it was new.

FAQ

Q1: What engines fit the 816608Q83 kit?
A: It fits V8 GM-based MerCruiser engines (305, 350, 377 CID) with Mercury ignition systems (1999–2001).

Q2: What’s included?
A: A complete set of eight red wires, each pre-fitted with plug boots.

Q3: Can I use these in saltwater?
A: Absolutely. The marine-grade insulation and terminals are built to resist corrosion.

Q4: Is installation simple?
A: Yes. Swap them one by one to keep the firing order right — no special tools needed.

Q5: Why go OEM instead of aftermarket?
A: OEM wires fit perfectly, last longer, and deliver the consistent spark Mercury engines need for smooth running.