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Shift Interrupt Switch 87-814281A5 – MerCruiser Sterndrive
- $41.99
- $41.99
- Unit price
- per
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How to Match This Part
This aftermarket shift interrupt switch assembly replaces Mercury MerCruiser / Quicksilver 87-814281A5 (also marked 814281A5). It mounts on the engine shift bracket / shift plate. When the shift linkage presses the plunger during a shift out of gear, the switch momentarily interrupts ignition so the drive clutch can disengage under load.
Match this part in this order:
1. OEM number on the removed switch — 87-814281A5 or 814281A5
2. Engine serial number against the Compatible Engine Models table below
3. Physical form — plunger-actuated switch body with a two-wire lead set for the shift-bracket location
Compare plunger orientation, mounting points, and connector style with the product images before ordering. If your original switch carries a different OEM number or a different terminal layout, do not use this listing.
- Primary OEM: 87-814281A5
- Form: Plunger-actuated 2-wire switch
- Application: MerCruiser sterndrive shift bracket
Compatible Engine Models
This switch is used on MerCruiser sterndrive engines that call for OEM 87-814281A5, including applications paired with Alpha One Gen II and Bravo series drives. Confirm your engine serial number and the number on the removed switch before ordering. Serial location guide: Mercury Parts Diagrams.
| Engine Model | Years | Serial Number Range | Notes |
|---|---|---|---|
| 3.0L GM 181 I/L4 | 0L097000–0W301999 | MerCruiser sterndrive | |
| 3.0L GM 181 I/L4 | 1998 | 0L010042–0L096999 | MerCruiser sterndrive |
| 3.0LX GM 181 I/L4 | 1996–1997 | 0F604000–0K999999 | Shift-bracket application |
| 4.3L (GEN+) GM 262 V6 (2 BBL) | 1998 | 0L010044–0M614999 | MerCruiser sterndrive |
| 4.3LH (GEN+) GM 262 V6 (4 BBL) | 1998 | 0L010044–0M614999 | MerCruiser sterndrive |
| 4.3LX (GEN+) GM 262 V6 (2 BBL) | 1996–1997 | 0F803000–0K999999 | MerCruiser sterndrive |
| 4.3LXH (GEN+) GM 262 V6 (4 BBL) | 1996–1997 | 0F803114–0K999999 | MerCruiser sterndrive |
| 4.3L CARB Alpha/Bravo | 0M615000–0W300012 | Alpha / Bravo carbureted | |
| 350 MAG Alpha GM 350 V8 (4 BBL) | 1997 | 0K001527–0K999999 | Alpha application |
| 5.0L GM 305 V8 (2 BBL) | 1998–2001 | 0L015751–0M599999 | MerCruiser sterndrive |
| 5.0L CARB Alpha/Bravo | 0M600000–0W300009 | Alpha / Bravo carbureted | |
| 5.7L GM 350 V8 (2 BBL) | 1997 | 0K001527–0K999999 | MerCruiser sterndrive |
| 5.7L GM 350 V8 (2 BBL) | 1998–2001 | 0L010037–0M599999 | MerCruiser sterndrive |
| 5.7L CARB Alpha/Bravo | 0M600000–0W300754 | Alpha / Bravo carbureted | |
| 5.7LX GM 350 V8 (4 BBL) | 1997 | 0K001527–0K999999 | MerCruiser sterndrive |
Technical Specifications
| Specification | Value |
|---|---|
| Product type | Shift interrupt switch assembly |
| Primary OEM | 87-814281A5 (also 814281A5) |
| Mounting | Engine shift bracket / shift plate |
| Actuation | Plunger actuated by shift-plate lever |
| Electrical | 2-wire circuit |
| Function | Momentary ignition interrupt during shift out of gear |
| Required quantity | 1 switch per listed application |
Installation Guide
- 1Switch the ignition off, disconnect the battery, and allow the engine compartment to cool before beginning work.
- 2Locate the switch on the engine shift bracket or shift plate. Confirm the OEM number, plunger orientation, and two-wire layout against the replacement.
- 3Note wire routing, disconnect the two leads, and remove the original switch while retaining the existing mounting hardware unless it is damaged.
- 4Mount the replacement on the original bracket and reconnect each lead securely. Confirm the shift-plate actuator contacts the plunger correctly through the shift travel.
- 5Reconnect the battery and verify shift-interrupt operation following the manufacturer’s service procedure before returning the boat to service.
Note: Professional installation is recommended. A stiff or misadjusted shift cable can cause stalling that is not fixed by switch replacement alone.
Troubleshooting & FAQ
Important Notes
- Confirm OEM number, plunger orientation, mounting layout, and two-wire terminals against the original switch before ordering.
- This listing covers MerCruiser sterndrive engines that call for 87-814281A5 in the serial ranges above — not unrelated trim senders, neutral-safety switches, or outboard ignition switches.
- This is an aftermarket part. Brand names and OEM numbers are for reference only.
- Professional installation is recommended for shift-bracket electrical work.
Why Choose JLM MARINE?
- Precision Fit: Cross-referenced to Mercury MerCruiser / Quicksilver 87-814281A5 for the listed sterndrive shift-bracket applications.
- Quality Control: Each batch is inspected for dimensional consistency and workmanship.
- Direct from Manufacturer: Aftermarket marine switch engineered for MerCruiser shift-interrupt duty on Alpha/Bravo sterndrive packages that call for 87-814281A5.
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