Sierra 18-28084 Plug Wire Set for Mercury Outboard Engines, 1 Pack

The Sierra 18-28084 Plug Wire Set is a replacement ignition wire set built for Mercury outboard engines. Ignition plug wires carry high-voltage spark from the coil to each spark plug, and worn, cracked, or corroded wires are a common cause of hard starting, misfires, and rough idle on outboard motors. This set is sold as a single 1-pack unit with a plug-in connector type for straightforward installation without special tools or splicing.

Sierra manufactures ignition and electrical components specifically for the marine industry, engineered to hold up to the vibration, heat, and moisture exposure that outboard engines see on the water. Replacing a full plug wire set rather than individual wires helps ensure consistent resistance and spark delivery across all cylinders, which supports smoother running and more reliable starts.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-28084
• Category: Mercury Outboard Spark Plug Wires
• Item Type: Plug Wire Set
• Connector Type: Plug in
• Number of Items: 1
• Package Dimensions: 2.81 inches L x 10.44 inches W x 7.13 inches H
• Weight: 0.49 pounds
• Country of Origin: China
• UPC: 808282341435

Fitment

Fits Mercury outboard engines using the 18-28084 ignition wire set.

Frequently Asked Questions

What engines does the Sierra 18-28084 plug wire set fit? The Sierra 18-28084 is a plug wire set designed for Mercury outboard engines, sold as a complete 1-pack ignition wire set.

How many plug wires are included in the 18-28084 set? This set is packaged as a single 1-pack unit, sold as one complete ignition plug wire set rather than individual wires.

What connector type does this plug wire set use? The 18-28084 uses a plug-in connector type, allowing it to connect directly without additional splicing hardware.

How much does the Sierra 18-28084 plug wire set weigh? The Sierra 18-28084 plug wire set weighs 0.49 pounds.

What are the package dimensions of the 18-28084 plug wire set? It ships in packaging measuring 2.81 inches long, 10.44 inches wide, and 7.13 inches high.

Is the Sierra 18-28084 a genuine Sierra part? Yes, 18-28084 is Sierra's own manufacturer part number for this ignition plug wire set, not a generic aftermarket substitute.

Why replace ignition plug wires on an outboard engine? Worn or corroded ignition plug wires can cause misfires, hard starting, and rough idle, and replacing the full set with the Sierra 18-28084 helps restore consistent spark delivery to each cylinder.

Where is the Sierra 18-28084 manufactured? The Sierra 18-28084 plug wire set is manufactured in China.

Does the 18-28084 come with installation instructions? The listing for the Sierra 18-28084 does not specify included installation instructions; it is packaged as the plug wire set itself.

What is the UPC for the Sierra 18-28084 plug wire set? The UPC for the Sierra 18-28084 plug wire set is 808282341435.