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Shift Interrupt Switch – Fits MerCruiser Alpha & Bravo Engines (Replaces 87-814281A5)
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Shift Interrupt Switch – Fits MerCruiser Alpha & Bravo Engines (Replaces 87-814281A5)
This shift interrupt switch is designed for Mercury MerCruiser stern drive engines from model years 1996–2001. It is compatible with a wide range of models, including the 3.0L, 4.3L, 5.0L, and 5.7L engines equipped with Alpha One and Bravo outdrives, ensuring smooth and reliable shifting.
This component is a direct replacement for the following Mercury/MerCruiser part numbers: 87-814281A5 and 814281A5.
- Installation Type: Direct bolt-on replacement for easy installation.
- Connection: Features a standard 2-wire electrical connection.
- Function: Momentarily cuts ignition when shifting from gear to neutral under load to prevent gear damage and ensure smooth operation.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 87-814281A5 |
| Mercury/MerCruiser | 814281A5 |
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 | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 3.0L Alpha One | 135-140 | 4-Stroke | 1996-2001 | 87-814281A5 | GM 181 I/L4 |
| MerCruiser | 3.0LX Alpha One | 135-140 | 4-Stroke | 1996-1997 | 87-814281A5 | GM 181 I/L4 |
| MerCruiser | 4.3L Alpha/Bravo | 190-225 | 4-Stroke | 1998-2001 | 87-814281A5 | 4.3L CARB ALPHA/BRAVO |
| MerCruiser | 4.3L (GEN+) | 190-225 | 4-Stroke | 1996-1997 | 87-814281A5 | 4.3LX (2 BBL) GM 262 V-6 |
| MerCruiser | 4.3LH (GEN+) | 190-225 | 4-Stroke | 1998 | 87-814281A5 | 4.3LH (4 BBL) GM 262 V-6 |
| MerCruiser | 4.3LXH (GEN+) | 190-225 | 4-Stroke | 1996-1997 | 87-814281A5 | 4.3LXH (4 BBL) GM 262 V-6 |
| MerCruiser | 5.0L Alpha/Bravo | 220-260 | 4-Stroke | 1998-2001 | 87-814281A5 | 5.0L (2 BBL) GM 305 V-8 |
| MerCruiser | 5.0L CARB Alpha/Bravo | 220-260 | 4-Stroke | 1998-2001 | 87-814281A5 | Alpha and Bravo models |
| MerCruiser | 5.7L Alpha/Bravo | 250-300 | 4-Stroke | 1997-2001 | 87-814281A5 | 5.7L (2 BBL) GM 350 V-8 |
| MerCruiser | 5.7L CARB Alpha/Bravo | 250-300 | 4-Stroke | 1997-2001 | 87-814281A5 | Alpha and Bravo models |
| MerCruiser | 5.7LX | 250-300 | 4-Stroke | 1997 | 87-814281A5 | 5.7LX (4 BBL) GM 350 V-8 |
| MerCruiser | 350 MAG Alpha | 300 | 4-Stroke | 1997 | 87-814281A5 | 350 MAG (4 BBL) GM 350 V-8 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Shift Interrupter Micro Switch Assembly |
| Installation | Direct Replacement |
| Fuel Type | Gasoline |
| Connection | 2-Wire Electrical Connection |
| Housing Material | Plastic |
| Housing Color | Black |
| Fitting Type | Bolt-on |
| Warranty | Yes (specifics vary by seller) |
| Other Technical Attributes | Momentarily cuts ignition when shifting from gear to neutral under load |
Package Contents
- 1 x Shift Interrupter Micro Switch Assembly (87-814281A5)
Installation Guide
- Safety First: Ensure the engine is off and cool. Disconnect the boat's battery to prevent electrical shorts.
- Locate the Switch: Find the old shift interrupt switch, typically mounted on the shift cable bracket near the engine.
- Disconnect Wiring: Carefully unplug the 2-wire electrical connector from the old switch.
- Remove Old Switch: Unscrew the mounting bolt(s) holding the switch in place and remove it.
- Install New Switch: Position the new switch correctly and secure it with the original mounting hardware.
- Reconnect Wiring: Plug the electrical connector firmly into the new switch.
- Restore Power: Reconnect the battery terminals.
- Test Operation: With the boat safely secured, start the engine and test the shifting from neutral into forward and reverse to ensure the engine runs smoothly and does not stall.
Troubleshooting & FAQ
Q: How do I know if this shift interrupt switch will fit my engine?
A: Please verify your engine model and year against the "Compatible Engine Models" table. Cross-reference your existing part number with those listed (87-814281A5) to ensure an exact match.
Q: What is the function of a shift interrupt switch?
A: Its purpose is to momentarily cut the engine's ignition for a split second when you shift out of gear (from forward or reverse to neutral). This brief interruption of power relieves pressure on the drive gears, allowing for a smoother, easier shift and preventing damage to the dog clutch.
Q: What are common signs that my shift interrupt switch is failing?
A: Common symptoms include the engine stalling when shifting into neutral, difficulty shifting out of gear, or a "clunking" noise during shifts. If the switch is faulty, the engine may not "stumble" as it should, making shifting difficult.
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.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
Parts Finder
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