Ignition Key Switch for Mercury Outboard 87-88107A5 Push-to-Choke 7-Terminal
mms-528-mp41000
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Ignition Switch 87-88107A5
Mercury Outboard Push-to-Choke Panel Mount
Upgrade or replace your marine ignition system with this heavy-duty, 7-terminal ignition key switch. Specifically engineered for Mercury Outboards with magneto ignition, this switch provides reliable starting power and seamless "Push-to-Choke" functionality for easier engine priming.
Key Features
- β Push-to-Choke: Integrated momentary action
- β 4-Position Logic: Off - Run - Start (+ Choke)
- β Weatherproof: Splash-proof rubber boot included
- β Easy Install: 7 Secure screw terminals
Technical Specs
| Voltage: | 12V DC |
| Amperage: | 20A |
| Terminals: | 7 Screw Type |
| Hole Size: | 7/8" (22mm) |
| Max Panel: | 16mm (5/8") |
Compatibility / Fitment Guide
| System Type | Engine Application | Notes |
|---|---|---|
| Mercury / Mariner | Various Outboard Models | Magneto Ignition Only |
| Control Boxes | Side Mount & Panel Mount | Replaces 7-terminal units |
OEM Cross Reference
| Mercury / Quicksilver | 87-88107A5, 87-88107A3, 87-88107 |
| Sierra Marine | 18-5122 |
| EMP | 87-08107 |
Questions & Answers
Is this a genuine original part?
This is a premium quality aftermarket replacement part, manufactured by 4Boats partners to meet or exceed original equipment (OE) standards for fitment and performance.
How do I know if it is compatible?
Verify that your current switch has 6 or 7 terminals and matches the 87-88107A5 part number. This is designed for magneto-style ignitions found on most Mercury outboards.
What are the terminal connections for this switch?
The 7 terminals typically follow standard Mercury color coding: Red (Battery), Black (Ground), Black/Yellow (Magneto), Purple (Ignition), Yellow/Black (Choke), and Yellow/Red (Start).
Note: Please verify your original part number and terminal configuration against the references above at 4boats.co.uk before purchasing.
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