Description
Sierra Mercury 3-Position Magneto Ignition Switch with Potted Leads – MP51090
A potted magneto ignition switch designed as an OEM-style replacement for listed Mercury outboard applications.
- Off-Run-Start magneto switch with push-to-choke
- Six color-coded potted wire leads
- Heavy-duty potted construction
- Molded umbrella-style key
- Non-conductive polyester housing with corrosion-resistant internal construction
Specifications
- Part number: MP51090
- Type: 3-position magneto
- Function: Off – Run – Start; push to choke
- Hole size: 7/8 in.
- Maximum panel thickness: 5/8 in.
- Terminals: 6 color-coded potted wire leads
- Choke rating: 7A @ 12V DC
- Ignition rating: 15A @ 12V DC
- Solenoid rating: 30A @ 12V DC
Interchange / Replaces
- Mercury Marine: 87-17009A5
Application / Fitment Notes
Sierra lists selected Mercury international 9.9-30 hp applications. Verify model, year/serial range and OEM switch number before installation.

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