Starter Solenoid Relay – Fits Mercury/Mariner Outboard 115-250 HP (Replaces 89-817109A1, 89-817109A2, 89-817109A3)
Starter Solenoid Relay – Fits Mercury/Mariner Outboard 115-250 HP (Replaces 89-817109A1, 89-817109A2, 89-817109A3) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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Starter Solenoid Relay – Fits Mercury/Mariner Outboard 115-250 HP (...
Starter Solenoid Relay – Fits Mercury/Mariner Outboard 115-250 HP (Replaces 89-817109A1, 89-817109A2, 89-817109A3) is backordered and will ship as soon as it is back in stock.
Product Details
This Starter Solenoid Relay is designed for a wide range of Mercury and Mariner outboard engines from the 1990s to 2000s, covering 40 HP to 250 HP models. It is engineered as a direct-fit replacement to ensure reliable starting performance.
It serves as an interchange for several part numbers, including Mercury 89-817109A1, 89-817109A2, 89-817109A3, Sierra 18-5834, and Arco SW109, among others.
- Engineered for direct replacement.
- Features a 4-terminal connection with an isolated base.
- Operates at 12V with a 50A working current.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 89-817109A1 |
| Mercury | 89-817109A2 |
| Mercury | 89-817109A3 |
| Sierra | 18-5834 |
| Arco | SW109 |
| Arrowhead | SMR6010 |
| J&N | 240-22131 |
| WAI | 67-731 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This solenoid fits various Mercury and Mariner outboard engines. While specific years are not available for all models, it generally covers 1990s–2000s outboards from 40 to 250 HP.
| Brand | Model | Rated HP | OEM Part No. |
|---|---|---|---|
| Mercury | Outboard | 40 | 89-817109A1/A2/A3 |
| Mercury | Outboard | 50 | 89-817109A1/A2/A3 |
| Mercury | Outboard | 65 | 89-817109A1/A2/A3 |
| Mercury | Outboard | 75 | 89-817109A1/A2/A3 |
| Mercury | Outboard | 80 | 89-817109A1/A2/A3 |
| Mercury | Outboard | 90 | 89-817109A1/A2/A3 |
| Mercury | Outboard | 100 | 89-817109A1/A2/A3 |
| Mercury | Outboard | 105 | 89-817109A1/A2/A3 |
| Mercury | Outboard | 115 | 89-817109A1/A2/A3 |
| Mercury | Outboard | 125 | 89-817109A1/A2/A3 |
| Mercury | V-135 | 135 | 89-817109A1/A2/A3 |
| Mercury | V-150 | 150 | 89-817109A1/A2/A3 |
| Mercury | V-175 | 175 | 89-817109A1/A2/A3 |
| Mercury | V-200 | 200 | 89-817109A1/A2/A3 |
| Mercury | V-225 | 225 | 89-817109A1/A2/A3 |
| Mercury | V-250 | 250 | 89-817109A1/A2/A3 |
Technical Specs
- Product Type
- Starter Solenoid Relay
- Installation
- Direct replacement
- Connection
- 4-Terminal
- Housing Color
- Black
- Fitting Type
- Battery Terminal: 1/4-20, Motor Terminal: 1/4-20, Switch Terminal: 8-32, Ground Terminal: 8-32
- Thread Size
- See Fitting Type
- Working Voltage
- 12V
- Working Current
- 50A
- Inrush Current
- 60A
- Warranty
- 1 Year
- Other Technical Attributes
- Isolated Base
What’s in the Box
- 1 x Starter Solenoid Relay (89-817109A3)
Installation Notes
- Disconnect the battery cables (negative first) to prevent electrical shorts.
- Locate the existing starter solenoid relay on your engine. Note the wiring connections.
- Carefully disconnect the wires from the terminals of the old solenoid.
- Unbolt and remove the old solenoid from its mounting point.
- Mount the new solenoid, ensuring it is secure.
- Reconnect the wires to the corresponding terminals on the new solenoid based on your notes. Ensure connections are clean and tight.
- Reconnect the battery cables (positive first, then negative).
- Test the ignition system to ensure proper function.
Troubleshooting & FAQ
How do I know if this solenoid relay will fit my specific engine model?
This relay fits a wide range of Mercury/Mariner outboards from 40 to 250 HP, primarily from the 1990s-2000s. The best way to confirm fitment is to match your original part number to the references listed in our Part Number Matrix. Also, visually compare your old part to our product images.
What are the common signs of a failing starter solenoid?
Symptoms of a bad solenoid include a clicking sound when you turn the key but the engine doesn't crank, the starter remaining engaged after the engine starts, or no sound at all. These issues indicate the solenoid is failing to properly manage electrical current to the starter motor.
Is this solenoid for 2-stroke or 4-stroke engines?
This solenoid is listed as compatible with a broad range of outboard models that includes both 2-stroke and 4-stroke designs. Its 4-terminal, isolated base configuration is used across various engine types. Always verify by part number for your specific application.
What is the difference between a 3-terminal and 4-terminal solenoid?
A 4-terminal solenoid, like this one, has an isolated base (I-post). The fourth terminal provides a dedicated ground path for the activation circuit, which is common in marine applications to ensure a reliable ground, separate from the mounting bracket.
How do I test my old solenoid to confirm it's the problem?
With the battery disconnected, you can use a multimeter to check for continuity across the two large terminals when the solenoid is activated (by applying 12V to the small activation terminal). A lack of continuity indicates a failure. For safety, this test should be performed by someone with experience in marine electrical systems.
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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