Sierra 18-28046 Plug Wire Set, 8-Cylinder Marine Ignition Wires

The Sierra 18-28046 Plug Wire Set is a complete set of ignition wires engineered for 8-cylinder marine engines. Ignition wires carry high-voltage current from the distributor and coil to each spark plug, and worn or cracked wires are a common cause of misfires, rough idle, hard starting, and lost power on the water. This set replaces the full run of wires as a matched kit rather than one wire at a time, which keeps resistance and firing consistent across all cylinders.

The set includes the coil wire, the wires running to the distributor end, the spark plug end wires, the coil end wire, and the coil-distributor end wire, each sized to Sierra's marine ignition specifications for an 8-cylinder application. Sierra builds its ignition wires to marine-duty standards, accounting for the heat, vibration, and moisture exposure that engine compartments see, which is a key difference from automotive wire sets not intended for marine use.

This is a direct-fit replacement kit for 8-cylinder marine engines using this wire configuration. Install a full set at the same time you're doing a tune-up or troubleshooting an ignition misfire, since mixing old and new wires can leave uneven resistance across cylinders.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-28046
• Number of Cylinders: 8
• Coil Wire: 12/24
• Distributor End: 9
• Spark Plug End: 1
• Coil End: 9
• Coil Distributor End: 5
• Connector Type: Plug in
• Number of Items: 1
• Weight: 1.9 pounds
• UPC: 808282341374

Frequently Asked Questions

What engines does the Sierra 18-28046 plug wire set fit? The Sierra 18-28046 is built for 8-cylinder marine engines and includes a full set of ignition wires sized for that cylinder count.

How many wires come in the 18-28046 set? One complete set is included, covering the coil wire, the distributor end wire, the spark plug end wire, the coil end wire, and the coil-distributor end wire for an 8-cylinder engine.

Should I replace all the ignition wires at once? Yes, replacing the full 18-28046 set together keeps resistance consistent across all 8 cylinders, rather than mixing new and old wires that can cause uneven firing.

How much does the 18-28046 plug wire set weigh? The Sierra 18-28046 plug wire set weighs 1.9 pounds.

Is the Sierra 18-28046 made for marine use specifically? Yes, Sierra builds the 18-28046 wire set to marine ignition specifications rather than automotive standards, since engine compartments on boats face more heat, vibration, and moisture exposure.

What connector type does the 18-28046 use? The 18-28046 set uses a plug-in connector type.

What are common signs that ignition wires need replacing? Misfires, rough idle, hard starting, and reduced power are common symptoms of worn ignition wires, and installing the Sierra 18-28046 as a complete set addresses all cylinders at once.

How many items are included with the 18-28046? The Sierra 18-28046 ships as a single set (1 item) containing the wires for all 8 cylinders.

Is 18-28046 the correct part number to search for this wire set? Yes, 18-28046 is the Sierra part number for this plug wire set and is the number to reference when ordering.

Can the 18-28046 be used for a routine tune-up? Yes, the 18-28046 plug wire set is commonly installed during a tune-up alongside spark plug replacement on 8-cylinder marine engines.