Spark Plug Wire – Fits Mercury/Mariner 150-200 HP (Replaces 84-813715A1)
Spark Plug Wire – Fits Mercury/Mariner 150-200 HP (Replaces 84-813715A1) is backordered and will ship as soon as it is back in stock.
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Spark Plug Wire – Fits Mercury/Mariner 150-200 HP (Replaces 84-8137...
Spark Plug Wire – Fits Mercury/Mariner 150-200 HP (Replaces 84-813715A1) is backordered and will ship as soon as it is back in stock.
Product Details
This 9" Spark Plug Wire – Fits Mercury/Mariner Outboard 150-200 HP (Replaces 84-813715A1) is designed to provide a reliable ignition connection for Mercury and Mariner V6 outboard engines (150–200 HP, 2-Stroke, 1970–1988). It ensures efficient transfer of energy from the ignition coil or distributor to the spark plug for consistent engine performance.
Serves as a direct replacement for Sierra part 18-5227-1, Mercury 84-813715A1, and HEPENG 18-5227-1.
- Installs directly as a replacement for the original part.
- Features a 7mm silicone jacket and a metallic/magnetic suppression core for durability and protection against interference.
- Package includes one 9-inch spark plug wire.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 84-813715A1 |
| Sierra | 18-5227-1 |
| HEPENG | 18-5227-1 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is designed for specific Mercury and Mariner V-6 outboards.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | V-150 | 150 | 2-Stroke | 1970–1988 | 84-813715A1 | Serial range: 4868998-0A904645 |
| Mercury | V-150 Magnum | 150 | 2-Stroke | 1970–1988 | 84-813715A1 | Serial range: 5600162-0A904645 |
| Mercury | V-150 Marathon | 150 | 2-Stroke | 1970–1988 | 84-813715A1 | Serial range: 5600162-0A904645 |
| Mercury | V-150 Work | 150 | 2-Stroke | 1970–1988 | 84-813715A1 | Serial range: 4868998-0A904645 |
| Mercury | V-150-XR-2 | 150 | 2-Stroke | 1970–1988 | 84-813715A1 | Serial range: 4868998-0A904645 |
| Mercury | V-1500 | 150 | 2-Stroke | 1970–1988 | 84-813715A1 | Serial range: 4868998-0A904645 |
| Mercury | V-175 | 175 | 2-Stroke | 1970–1988 | 84-813715A1 | Serial range: 4301235-0C100860, 8058870-UP |
| Mercury | V-200 | 200 | 2-Stroke | 1970–1988 | 84-813715A1 | Serial range: 5239232-0C100860 |
Technical Specs
- Product Type
- Spark Plug Wire
- Installation
- Direct replacement
- Length
- 9 inches (229 mm)
- Compatible With
- Mercury/Mariner outboard engines
- Wire Diameter
- 7mm
- Core Type
- Metallic/magnetic suppression core
- Material
- Silicone insulation with stainless steel conductor
- Connection Type
- Terminal end for coil/distributor, boot end for spark plug
- Color
- Black
What’s in the Box
- 1 x 9" Spark Plug Wire (84-813715A1)
Installation Notes
- Safety First: Ensure the engine is completely cool and the battery is disconnected before starting.
- Locate Wires: Identify the spark plug wire to be replaced. It's often helpful to replace wires one at a time to avoid mixing up the firing order.
- Remove Old Wire: Firmly grasp the boot at the spark plug end and twist gently to break the seal, then pull it straight off. Do the same on the distributor/coil end. Do not pull on the wire itself.
- Inspect Connections: Check the spark plug and distributor/coil terminal for corrosion or damage. Clean if necessary.
- Install New Wire: Lightly apply dielectric grease to the inside of both boots of the new wire. This helps with sealing and future removal.
- Connect and Secure: Push the spark plug boot firmly onto the spark plug until it clicks into place. Repeat for the distributor/coil end. Ensure both connections are secure.
- Final Check: Reconnect the battery, start the engine, and check for smooth operation.
Troubleshooting & FAQ
How do I know if my spark plug wires need replacing?
Common signs of failing spark plug wires include rough idling, engine misfires, poor acceleration, decreased fuel economy, and visible damage like cracks, burns, or corrosion on the wires or boots.
Is this a set of wires or just one?
This listing is for a single 9-inch spark plug wire. Please verify the quantity you need for your specific engine, as V6 models typically require multiple wires of varying lengths.
What is a magnetic suppression core?
A magnetic suppression core is designed to reduce electromagnetic interference (EMI) and radio frequency interference (RFI) generated by the ignition system. This helps prevent interference with onboard electronics and radio equipment.
Will this fit my newer Mercury engine?
This specific wire is designed for Mercury/Mariner V6 models from 1970–1988. It is not compatible with newer models. Always verify the part number and engine specifications before purchasing.
Can I cut this wire to a shorter length?
No. These wires are manufactured to a specific length and resistance. Cutting them will alter their performance and could cause engine damage or ignition system failure.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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