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Ignition Key Switch – Fits Mercury/Mariner DFI, EFI & MPI Outboard Motors (Replaces 87-17009A5)
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Ignition Key Switch – Fits Mercury/Mariner DFI, EFI & MPI Outboard Motors (Replaces 87-17009A5)
This panel-mounted ignition key switch is a reliable replacement for Mercury and Mariner outboard motor control boxes requiring a 6-wire connection. It is designed for compatibility with a range of DFI (Direct Fuel Injection), EFI (Electronic Fuel Injection), and MPI (Multi-Point Injection) engines.
This unit is a direct replacement for Mercury part numbers 87-17009A5 and 87-17009A2, as well as Sierra part numbers MP41070-2, MP41070-1, and MP41070.
- Installation Type: Panel Mount
- Connection: 6-Wire
- Package Includes: 1x Ignition Key Switch, 2x Keys
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 87-17009A5 |
| Mercury | 87-17009A2 |
| Sierra | MP41070-2 |
| Sierra | MP41070-1 |
| Sierra | MP41070 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury/Mariner | DFI EFI MPI Outboard Motors | Various | Various | 87-17009A5 | Suits serial range: 0N001590+, 0G575500+ |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Ignition Key Switch |
| Installation | Panel Mount |
| Fuel Type | Gasoline |
| Connection | 6-Wire |
| Housing Material | Polyester Anti-Corrosion Housing with Brass Contacts |
| Dimensions | 57 × 37 mm (2.3 × 1.5 in) |
| Weight | 117g (4.1 oz) approximate |
| Mounting Hole | 7/8" Thread Size |
| Operating Voltage | 12V DC |
| Current Rating | Ignition: 15 Amp @ 12V DC Solenoid: 30 Amp @ 12V DC Choke: 7 Amp @ 12V DC |
| Switch Positions | 3-Position (OFF - RUN - START) |
| For Panels Up To | 15.87 mm (5/8") thickness |
| Other Technical Attributes | Has return spring for 3 positions |
Package Contents
- 1 × Ignition Key Switch (87-17009A5)
- 2 × Ignition Keys
Installation Guide
- Safety First: Disconnect the boat's battery cables (negative first, then positive) to prevent electrical shorts.
- Access the Switch: Open or remove the control box panel to access the back of the old ignition switch.
- Label and Disconnect: Before disconnecting, label each wire to ensure correct placement on the new switch. Carefully unplug the 6-wire connector.
- Remove Old Switch: Unscrew the mounting nut on the front of the panel and remove the old ignition switch.
- Install New Switch: Insert the new ignition switch into the panel, orient it correctly, and tighten the mounting nut until snug. Do not overtighten.
- Reconnect Wires: Attach the 6-wire connector to the new switch, ensuring it is fully seated and secure.
- Test the System: Reconnect the battery (positive first, then negative) and test all switch positions (OFF, RUN, START) to confirm proper function before heading out on the water.
Troubleshooting & FAQ
Q: How do I confirm this ignition switch fits my specific Mercury engine?
A: This switch fits various Mercury/Mariner DFI, EFI, and MPI outboard motors. The best way to confirm is to match your existing part number to the ones listed in our cross-reference table (87-17009A5, 87-17009A2) or the Sierra equivalents. Also, ensure your system uses a 6-wire connection.
Q: What are the common signs that my ignition key switch is failing?
A: Common symptoms include difficulty turning the key, the engine not cranking or starting intermittently, the engine shutting off unexpectedly, or a loss of power to accessories when the key is in the 'RUN' position. Corrosion on the contacts can also be a visual indicator.
Q: Is this a direct replacement for the Sierra MP41070-2?
A: Yes, this ignition switch serves as a direct aftermarket replacement for Sierra part numbers MP41070-2, MP41070-1, and MP41070, along with the OEM Mercury numbers.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
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Когда вы размещаете заказ, мы оценим даты отправки и доставки для вас на основе доступности ваших товаров и выбранных вами вариантов доставки. В зависимости от выбранного вами поставщика услуг доставки, предполагаемые даты доставки могут отображаться на странице расценок на доставку.
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Основанная в 2002 году, компания JLM Marine зарекомендовала себя как специализированный производитель высококачественных морских деталей, базирующийся в Китае. Наша приверженность совершенству в производстве заслужила нам доверие ведущих мировых морских брендов.
Как прямой поставщик, мы обходим посредников, что позволяет нам предлагать конкурентоспособные цены без ущерба качеству. Такой подход не только поддерживает экономическую эффективность, но и гарантирует, что наши клиенты получают наилучшую ценность напрямую от источника.
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Parts Finder
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