Ignition Coil Harness for OMC Cobra, Volvo Penta & MerCruiser Sterndrives – OEM References 987229, 986661, 3854084, 3850279, 817376T01
Ignition Coil Harness for OMC Cobra, Volvo Penta & MerCruiser Sterndrives – OEM References 987229, 986661, 3854084, 3850279, 817376T01 is backordered and will ship as soon as it is back in stock.
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Ignition Coil Harness for OMC Cobra, Volvo Penta & MerCruiser S...
Ignition Coil Harness for OMC Cobra, Volvo Penta & MerCruiser Sterndrives – OEM References 987229, 986661, 3854084, 3850279, 817376T01 is backordered and will ship as soon as it is back in stock.
Product Details
This Ignition Coil Harness is a replacement coil-to-distributor wire harness for selected OMC Cobra, Volvo Penta, and MerCruiser stern-drive applications. It is supplied as one individual harness for connecting the ignition coil and distributor.
Application-specific reference numbers include OMC references 987229, 986661, 0987229, and 0986661; Volvo Penta references 3854084 and 3850279; and MerCruiser references 817376T, 817376T01, and 84-817376T01. Confirm the reference number and engine application before ordering.
- Replacement ignition coil harness for marine sterndrive applications
- Connects the ignition coil to the distributor
- Sold as one individual harness, not a complete ignition-wire set
- Fits only the engine and brand applications listed below
Part Number Matrix
Use the reference numbers below to compare the harness with the part currently installed on your engine.
| Brand / Application | Reference Part Number |
|---|---|
| OMC Cobra | 987229, 986661, 0987229, 0986661 |
| Volvo Penta Stern / Out Drive | 3854084, 3850279 |
| MerCruiser Stern / Out Drive | 817376T, 817376T01, 84-817376T01 |
Engine & Model Compatibility
Compatibility depends on the engine brand and displacement. Keep the brand, engine size, and reference number together when checking fitment.
| Brand | Engine Application | Reference Part No. |
|---|---|---|
| OMC Cobra | 181 CID, 3.0L | 987229, 986661, 0987229, 0986661 |
| OMC Cobra | 262 CID, 4.3L V6 | 987229, 986661, 0987229, 0986661 |
| OMC Cobra | 5.0L / 5.7L V8 small block | 987229, 986661, 0987229, 0986661 |
| OMC Cobra | 7.4L / 8.2L GM V8 big block | 987229, 986661, 0987229, 0986661 |
| Volvo Penta Stern / Out Drive | 4.3L V6 | 3854084, 3850279 |
| Volvo Penta Stern / Out Drive | 7.4L / 8.2L V8 big block | 3854084, 3850279 |
| MerCruiser Stern / Out Drive | 4.3L V6 | 817376T, 817376T01, 84-817376T01 |
| MerCruiser Stern / Out Drive | 7.4L / 8.2L V8 big block | 817376T, 817376T01, 84-817376T01 |
Technical Specs
- Part Type
- Ignition Coil Harness / Coil-to-Distributor Wire
- Product Format
- One individual replacement harness
- Applications
- OMC Cobra, Volvo Penta, and MerCruiser stern-drive engines listed above
- OMC Cobra Engine Range
- 181 CID 3.0L; 262 CID 4.3L V6; 5.0L / 5.7L V8 small block; 7.4L / 8.2L V8 big block
- Volvo Penta Engine Range
- 4.3L V6; 7.4L / 8.2L V8 big block
- MerCruiser Engine Range
- 4.3L V6; 7.4L / 8.2L V8 big block
What's in the Box
- 1 × Ignition Coil Harness
Installation Notes
- Disconnect the battery negative terminal before beginning work.
- Locate the ignition coil and distributor on the engine.
- Note the original routing and orientation before removing the existing harness.
- Disconnect the old harness from the ignition coil and distributor.
- Inspect both connection points for corrosion, looseness, or damage.
- Route the replacement harness along the original path, away from sharp edges and excessive heat.
- Connect both ends securely and reinstall any original clips or retainers.
- Reconnect the battery and verify normal engine starting and operation.
Troubleshooting & FAQ
What does this ignition coil harness connect?
This harness connects the ignition coil to the distributor. It is not a complete spark-plug wire set.
Does this harness fit every Volvo Penta 3.0L, 5.0L, or 5.7L engine?
No. The company fitment record specifically lists Volvo Penta 4.3L V6 and 7.4L / 8.2L V8 big-block applications. Do not apply the OMC Cobra 3.0L or 5.0L / 5.7L fitment to Volvo Penta engines without confirming the installed reference number.
Which OMC Cobra engines are listed?
The listed OMC Cobra applications include 181 CID 3.0L, 262 CID 4.3L V6, 5.0L / 5.7L V8 small block, and GM V8 7.4L / 8.2L big block engines.
Which MerCruiser engines are listed?
The listed MerCruiser stern-drive applications include 4.3L V6 and 7.4L / 8.2L V8 big-block engines. Confirm the installed reference number before ordering.
How do I know if the harness needs replacement?
Inspect the harness for cracked insulation, corrosion, loose terminals, arcing marks, or ignition-related symptoms such as intermittent misfires, rough running, difficult starting, or stalling.
Can I install this harness myself?
Installation is suitable for users familiar with basic marine-engine maintenance. Disconnect the battery, document the original routing, transfer the harness, and verify both connections. Use professional service if you are unsure about the ignition system.
Is this an OEM component?
This listing is for a replacement ignition coil harness. The reference numbers shown are manufacturer or application reference numbers used to confirm compatibility; the replacement itself should not be represented as an OEM-branded component.
How often should it be replaced?
There is no universal replacement interval. Inspect the harness during regular service and replace it if the insulation, terminals, or electrical performance shows deterioration.
Safety & Important Info
- Disconnect the battery before servicing ignition wiring.
- Confirm the engine brand, displacement, and installed reference number before ordering.
- Do not assume that a listed engine displacement fits across all brands; the brand-specific compatibility table controls fitment.
- Compare the connector or terminal arrangement and routing with the original harness before installation.
- Professional installation is recommended when working on marine ignition systems.
About Sea Sierra
- We supply replacement marine components for carefully identified engine and sterndrive applications.
- Clear application data helps you compare the installed part before ordering.
- For the best fitment result, use the engine brand, displacement, and reference number together.
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