9-Inch 8mm Marine Spark Plug Wire for Mercury/Mariner 2-Stroke Outboards – Replaces 84-813715A1
9-Inch 8mm Marine Spark Plug Wire for Mercury/Mariner 2-Stroke Outboards – Replaces 84-813715A1 is backordered and will ship as soon as it is back in stock.
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9-Inch 8mm Marine Spark Plug Wire for Mercury/Mariner 2-Stroke Outb...
9-Inch 8mm Marine Spark Plug Wire for Mercury/Mariner 2-Stroke Outboards – Replaces 84-813715A1 is backordered and will ship as soon as it is back in stock.
Product Details
This 9-inch 8mm marine spark plug wire is an aftermarket replacement lead for selected Mercury and Mariner 2-stroke outboard ignition systems. It is listed as a replacement for Mercury Marine OEM part number 84-813715A1 and is intended for applications that use the corresponding 9-inch, 8mm wire.
The wire connects the ignition component to the spark plug and is designed for marine service. Its molded silicone insulation, reinforced conductor construction, and corrosion-resistant terminals help protect the high-voltage connection from heat, moisture, vibration, and corrosion.
- 9-inch nominal spark plug wire length.
- 8mm marine ignition-wire construction.
- Replacement reference for Mercury Marine 84-813715A1.
- Designed for selected Mercury/Mariner 2-stroke outboard ignition applications.
- RFI/EMI-conscious construction helps reduce ignition interference with onboard electronics.
- Pre-greased silicone insulators and stainless-steel terminals support moisture-resistant installation.
Part Number Cross-Reference
Use the references below to compare the wire with the part currently installed on your engine. Part-number correspondence does not replace verification of the engine model, serial number, ignition configuration, and wire length.
| Brand or Source | Part Number | Description |
|---|---|---|
| Mercury Marine | 84-813715A1 | OEM reference for a 9-inch spark plug wire |
| Sierra | 18-5228-1 | 9-inch, 8mm spark plug wire reference |
Engine & Model Compatibility
The referenced ignition-wire catalog lists the OEM reference for selected Mercury/Mariner 2-stroke outboard applications, including the engine families below. Exact fitment depends on the complete model designation, ignition-system configuration, and serial-number range.
| Brand | Model Family | Rated HP | Stroke | Relevant Serial or Configuration Information | OEM Reference |
|---|---|---|---|---|---|
| Mercury/Mariner | V-150 XR4 | 150 | 2-Stroke | Serial range and ignition configuration must be checked against the engine catalog. | 84-813715A1 |
| Mercury/Mariner | V-175 | 175 | 2-Stroke | Catalog listings include multiple ignition configurations and serial ranges. | 84-813715A1 |
| Mercury/Mariner | V-200 | 200 | 2-Stroke | Catalog listings include XR1, EFI, and other configurations with different serial ranges. | 84-813715A1 |
| Mercury/Mariner | Other 2-stroke applications | Varies | 2-Stroke | Do not assume compatibility from horsepower alone; confirm the exact engine model, serial number, ignition components, and original wire dimensions. | 84-813715A1 |
Technical Specs
- Product Type
- Single marine spark plug wire
- Nominal Length
- 9 inches
- Wire Size
- 8mm
- Application
- Selected Mercury/Mariner 2-stroke outboard ignition systems
- Connection
- Ignition component to spark plug
- Insulation
- High-temperature silicone jacket and molded silicone insulators
- Terminals
- Corrosion-resistant stainless-steel terminals
- Interference Control
- Designed to help reduce radio-frequency and electromagnetic ignition interference
- Replacement Reference
- Mercury Marine 84-813715A1
What’s in the Box
- 1 x 9-inch 8mm marine spark plug wire
Installation Notes
- Turn off the engine, remove the ignition key, and disconnect the battery when appropriate for your boat and service procedure.
- Allow the engine to cool before servicing the ignition system.
- Identify the wire position and routing before removing the original wire.
- Grip each boot rather than pulling on the cable. Twist gently to release the old wire from the spark plug and ignition component.
- Inspect the spark plug and ignition terminals for corrosion, looseness, carbon tracking, or damage.
- Route the replacement wire along the original path, away from hot surfaces, sharp edges, and moving components.
- Press both boots fully onto their terminals. Confirm that the connections are secure before operating the engine.
- Reconnect the battery if it was disconnected and test the engine according to the service manual.
Troubleshooting & FAQ
Is this a single wire or a complete set?
This listing is for one 9-inch, 8mm spark plug wire. Multi-cylinder outboards require multiple wires, and the required lengths or wire types may vary by engine configuration.
What part number does this wire replace?
This wire is listed as a replacement reference for Mercury Marine 84-813715A1. Sierra 18-5228-1 is also listed as the corresponding 9-inch, 8mm wire reference.
Does it fit every Mercury 150, 175, or 200 HP outboard?
No. Horsepower alone is not sufficient to confirm fitment. Check the complete model designation, serial-number range, ignition-system configuration, original wire length, and terminal style before ordering.
How do I confirm the length?
Compare the 9-inch nominal length and 8mm wire size with the original wire. The replacement must reach both terminals without tension and must route safely without excessive slack near hot or moving parts.
Can I use this on a 4-stroke engine?
Do not assume compatibility with a 4-stroke engine. This wire is documented for selected Mercury/Mariner 2-stroke outboard ignition applications. Verify the exact engine application before installation.
What is RFI/EMI suppression?
RFI and EMI control helps reduce electrical interference generated by the ignition system. This can help limit noise affecting marine radios, GPS units, fishfinders, and other onboard electronics.
Is this an OEM component?
This is an aftermarket replacement wire, not a Mercury Marine-branded OEM component. It is identified by the OEM replacement reference shown above.
Safety & Important Information
- Verify the complete engine model, serial number, ignition configuration, terminal style, and original wire dimensions before purchase.
- Do not operate the engine with a loose, damaged, incorrectly routed, or arcing ignition wire.
- Disconnect the battery and follow the engine manufacturer’s service procedures when working near the ignition system.
- Professional installation is recommended when the correct ignition configuration or installation procedure is uncertain.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for service and repair applications.
- Application-Focused Information — Compare part references and engine conditions before installation.
- Support for Maintenance Projects — Parts selected for common marine repair and replacement needs.
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