Sierra 18-28080 Ignition Wire Set for 6-Cylinder Mercury Outboard Engines

The Sierra 18-28080 is an ignition wire set built for 6-cylinder Mercury outboard engines. It supplies the coil-to-distributor and spark plug wiring needed to deliver a clean, consistent spark to each cylinder, which is essential for reliable starting, smooth idle, and efficient combustion on the water. The wire set is constructed from marine-grade stainless steel conductors insulated with PVC or marine-grade TPE, materials chosen for their resistance to moisture, heat, vibration, and the corrosive marine environment that breaks down automotive-grade wiring over time. Each wire terminates in a Deutsch DT-style connector for a secure, weather-resistant connection at the coil, distributor, and plug ends, helping prevent the misfires and hard-starting issues that come from corroded or loose terminals.

This set is sold as a complete 1-pack kit, giving boat owners and marine technicians everything needed to replace an aging or damaged wire set in one job rather than sourcing individual wires. Sierra manufactures its ignition components specifically for marine use, so the 18-28080 is built to standards appropriate for engines that run in a wet, salt-exposed setting rather than repurposed automotive parts.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-28080
• Product Category: Ignition Wire Set
• Number of Cylinders: 6
• Fitment: Mercury outboard engines
• Material: Marine-grade stainless steel, PVC or marine-grade TPE
• Connector Type: Deutsch DT
• Wire Diameter: 1.3 millimeters
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.69 pounds
• Pack Quantity: 1 wire set
• UPC: 808282341398

Fitment

• 6-cylinder Mercury outboard engines

Frequently Asked Questions

What engines does the Sierra 18-28080 wire set fit? The Sierra 18-28080 is built for 6-cylinder Mercury outboard engines, supplying the coil, distributor, and spark plug wiring for that cylinder count.

How many wires come in the 18-28080 set? One complete wire set is included per pack, sized to cover all 6 cylinders on the compatible Mercury outboard engine along with the coil and distributor connections.

What material is the Sierra 18-28080 made from? Marine-grade stainless steel conductors are insulated in PVC or marine-grade TPE, materials selected for resistance to moisture, heat, and the corrosive marine environment.

What type of connector does this wire set use? A Deutsch DT-style connector is used at the wire ends, providing a secure, weather-resistant fit that helps prevent corrosion-related misfires.

How thick are the wires in the 18-28080 set? Each wire has a diameter of 1.3 millimeters, sized for reliable spark delivery in a 6-cylinder marine ignition system.

How much does the Sierra 18-28080 wire set weigh? The complete set weighs 0.69 pounds.

Is the Sierra 18-28080 an OEM Mercury part or an aftermarket replacement? The 18-28080 is a Sierra-manufactured ignition wire set produced specifically for marine use rather than an adapted automotive part, and it is sold under Sierra's own part number.

Why replace ignition wires instead of just the spark plugs? Ignition wires like the Sierra 18-28080 corrode and degrade from marine moisture and heat exposure over time, and worn wires can cause misfires, hard starting, or rough idle even with new spark plugs installed.

Does the 18-28080 include the coil and distributor wires or just plug wires? The set covers coil and distributor wiring in addition to the spark plug wires needed for the 6-cylinder Mercury outboard engine it fits.

Can the Sierra 18-28080 be used on a 4-cylinder or 8-cylinder engine? No, the 18-28080 is configured specifically for 6-cylinder applications; Sierra offers other wire set part numbers for different cylinder counts.

Is the Sierra 18-28080 suitable for salt water use? Yes, its marine-grade stainless steel and PVC or TPE insulation are designed to withstand the moisture and corrosion exposure of salt water marine environments.