9.5-Inch Double-Booted Spark Plug Wire – Replaces OMC 582365, Sierra 18-8818-1
9.5-Inch Double-Booted Spark Plug Wire – Replaces OMC 582365, Sierra 18-8818-1 is backordered and will ship as soon as it is back in stock.
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9.5-Inch Double-Booted Spark Plug Wire – Replaces OMC 582365, Sierr...
9.5-Inch Double-Booted Spark Plug Wire – Replaces OMC 582365, Sierra 18-8818-1 is backordered and will ship as soon as it is back in stock.
Product Details
This 9.5-inch double-booted spark plug wire is an aftermarket replacement for the OMC/Johnson/Evinrude ignition-wire application identified by OEM part number 582365. It connects the ignition coil to the spark plug and is intended for marine outboard ignition systems that use the corresponding double-booted wire configuration.
Catalog references identify this application with the aftermarket reference Sierra 18-8818-1. Confirm the original wire configuration, boot style, length, and part number before ordering. Model, horsepower, year, and cylinder-specific fitment should be verified against the engine's service information because the available catalog evidence does not establish a universal 10–235 HP or V4–V6 fitment range.
- 9.5-inch double-booted spark plug wire design.
- Connects an ignition coil to a spark plug.
- Aftermarket replacement for the specified application.
- Sold as the individual replacement wire described by the referenced catalog application; no four-wire set is confirmed.
Part Number Matrix
Use the following references to compare the replacement application with your existing part.
| Brand or Source | Part Number | Reference |
|---|---|---|
| OMC | 582365 | OEM application reference |
| Sierra | 18-8818-1 | Aftermarket cross-reference |
Engine & Model Compatibility
The available catalog references associate this wire with an OMC/Johnson/Evinrude spark-plug-wire application using OEM number 582365. Because this listing does not provide a complete model, year, horsepower, serial-number, or cylinder-by-cylinder application list for this specific replacement, verify the exact engine application before installation.
| Brand Family | Application | OEM Reference | Aftermarket Reference | Verification Required |
|---|---|---|---|---|
| OMC / Johnson / Evinrude | Engine ignition system using a 9.5-inch double-booted spark plug wire | 582365 | 18-8818-1 | Confirm engine model, year, serial range, wire length, boot style, and part number. |
Technical Specs
- Product Type
- Double-booted spark plug wire
- Length
- 9.5 inches
- Connection
- Ignition coil end to spark plug end
- Application Reference
- OMC 582365
- Aftermarket Reference
- Sierra 18-8818-1
- Installation
- Replacement installation; verify the original routing and terminal configuration before fitting
- Product Category
- Marine outboard ignition component
What’s in the Box
- 1 x 9.5-inch double-booted spark plug wire
Package quantity is stated for the individual replacement wire described by the catalog application. A complete multi-cylinder wire set is not included unless specifically shown in the order selection or package labeling.
Installation Notes
- Turn off the engine and disconnect the battery or ignition power source before beginning work.
- Identify the cylinder and record the original wire routing before removal.
- Remove the old wire by twisting the boot gently and pulling from the spark plug and ignition-coil terminals. Do not pull on the cable itself.
- Compare the replacement wire length, boot style, and terminal ends with the original wire before installation.
- Install the replacement wire on the correct spark plug and ignition-coil terminals, ensuring both boots are fully seated.
- Route the wire away from hot, sharp, or moving components and secure it using the original routing points where applicable.
- Reconnect the battery or ignition power source and test the engine according to the manufacturer's service procedure.
Troubleshooting & FAQ
How do I confirm that this wire fits my engine?
Match the original wire to the listed OEM reference 582365 or aftermarket reference 18-8818-1. Also compare the 9.5-inch length, double-booted design, terminal ends, engine model, and serial-number range. A model name alone is not sufficient to confirm fitment.
Is this a complete set of ignition wires?
No complete set is confirmed for this listing. The referenced catalog application describes a single 9.5-inch double-booted spark plug wire. Verify the package quantity shown with your order before purchasing multiple replacements.
What symptoms can indicate a damaged spark plug wire?
Possible symptoms include misfiring, rough running, loss of power, hard starting, or visible cracking, burning, corrosion, or damage to the insulation or terminals. Diagnose the ignition system before replacing parts.
Can I cut this wire to a different length?
No. Do not cut or alter the wire. The listed length and terminal configuration are part of the application. Use the correct replacement for your engine.
Is this an OEM part?
No. This is an aftermarket replacement associated with OMC OEM reference 582365 and aftermarket reference 18-8818-1.
Does the 582365 reference confirm every Johnson/Evinrude model?
No. A matching number is the strongest identification method available here, but model, year, serial range, cylinder position, wire length, and boot configuration should still be checked before ordering.
How should the wire be maintained?
Inspect it during routine service for heat damage, abrasion, cracking, loose boots, and corroded terminals. Keep the wire correctly routed and away from hot or moving engine components.
Safety & Important Information
- Disconnect the battery or ignition power source before servicing ignition wires.
- Verify the OEM number, wire length, boot style, engine model, and serial range before ordering.
- Do not rely solely on horsepower or engine-family descriptions for fitment.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended when the correct ignition-wire routing or application is uncertain.
About Sea Sierra
- We supply aftermarket marine replacement parts for repair and maintenance applications.
- Product references are provided to help customers compare the replacement with the original part.
- For the best fit, confirm the original part number and complete engine application before ordering.
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