Sierra 18-8818-1 Spark Plug Wire Lead, Replaces OMC 582365, 12 Inch, Johnson/Evinrude Outboard

The Sierra 18-8818-1 is a MagForce spark plug wire lead built for Johnson/Evinrude outboard engines. It carries current from the coil or distributor to the spark plug through a Kevlar-reinforced core wrapped in a durable stainless steel wound conductor, giving the wire the strength to resist heat, vibration, and corrosion over long service life.

The conductive center is carrier reinforced to keep the conductor path intact under continued flexing and engine heat, while premium silicone jacketing and boots provide high-temperature protection at both ends of the wire. The stainless steel wound conductor also delivers superior RFI suppression, protecting sensitive onboard electronics and instrumentation from ignition interference. Spark plug and distributor terminals are made of corrosion-resistant stainless steel for reliable conductivity at every connection point.

This wire lead measures 12 inches in length and is sold as a single wire, making it a direct fit for replacing a worn or damaged lead on Johnson/Evinrude outboard ignition systems. It replaces OMC 582365 and is backed by Sierra's warranty coverage.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8818-1
• Product Type: Spark Plug Wire Lead
• Length: 12 inches
• Core Material: Kevlar
• Conductor Material: Stainless Steel (wound)
• Jacket/Boot Material: Silicone
• Terminal Material: Stainless Steel
• Weight: 0.11 pounds
• Quantity: 1 wire
• UPC: 808282194468

Fitment

• Johnson/Evinrude outboard engines

Replaces (OEM)

• OMC 582365

Frequently Asked Questions

What does the Sierra 18-8818-1 replace? The 18-8818-1 replaces OMC 582365, so it is a direct swap for that original spark plug wire lead on applicable Johnson/Evinrude outboard engines.

How long is this spark plug wire? It measures 12 inches in length, sized for direct replacement of a single spark plug wire lead.

What is the wire's core made of? A Kevlar core runs through the 18-8818-1, chosen for durability and long service life under continuous engine heat and vibration.

Will this wire cause radio or electronics interference? No. The stainless steel wound conductor in the 18-8818-1 provides RFI suppression, which reduces ignition interference with sensitive onboard electronics.

What engines is the 18-8818-1 designed for? This Sierra wire lead is designed for Johnson/Evinrude outboard engines.

Is this a genuine Sierra part or aftermarket? The 18-8818-1 is a genuine Sierra MagForce part, sold under Sierra's own part number and backed by Sierra's warranty.

What material are the spark plug and distributor terminals? The terminals on the 18-8818-1 are corrosion-resistant stainless steel, chosen to maintain conductivity in a marine environment.

How many wires come in this listing? The 18-8818-1 is sold as a single spark plug wire lead, not a full wire set.

What protects the wire from engine heat? Premium silicone jacketing and boots cover the 18-8818-1, providing high-temperature protection along the wire and at its terminal ends.

How much does the 18-8818-1 weigh? This spark plug wire lead weighs 0.11 pounds.

Does the conductive center resist wear from flexing? Yes, the conductive center of the 18-8818-1 is carrier reinforced to keep the conductor intact under repeated flexing and heat cycling.