3-Position Push to Choke Magneto Ignition Switch, Off-Run-Start
Mouse Over to Zoom
Click to Enlarge

SIERRA3-Position Push to Choke Magneto Ignition Switch, Off-Run-Start


In stock online.

Add extra coverage from the date of purchase beyond the manufacturer’s warranty.  View Details

Model # 10530079 | Mfg # MP51090UPC # 808282269067


3-Position Push to Choke Magneto Ignition Switch, Off-Run-Start

Name Value
Type Switches

Product Overview

This magneto ignition switch is a direct replacement for Mercury Marine 87-17009A5.

Sierra's Polyester Ignition Switch is impact- and corrosion-resistant and fits a standard 7/8"dia. hole. The six color-coded wire leads match Mercury Marine factory color codes for easy installation. This three-position magneto switch provides Off-Run-Start with push-to-choke. Includes two umbrella type keys and different key codes for added security.

Key Features

  • Maximum corrosion protection eliminates oxidation
  • Inner seal between cylinder lock and contact plate
  • Non-conductive housing eliminates potential shorts
  • Heavy-duty potted construction
  • Minimal bleed per circuit
  • Three-position magneto switch
  • Push-to-choke
  • Exact OEM replacement for Mercury Marine 87-17009A5
  • Colors on switch wires match factory color codes


  • Material: Marine-grade glass-filled polyester
  • Length: Short, 5/8" maximum panel thickness
  • Hole Size: 7/8"
  • Terminal Type: Six color-coded wire leads/potted
  • Back Up Nut: Not required
  • Face Nut: Hex black plastic
  • Choke: Push-to-choke
  • Positions: Off-Run-Start


  • Ignition: 15A @ 12V DC
  • Solenoid: 30A @ 12V DC
  • Choke: 7A @ 12V DC

The Sierra Engine Parts Selector

In addition to ignition switches, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see our Engine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.


The West Advisor articles have answered boaters' questions and provided solutions to boating problems for more than 20 years. West Marine has compiled one of the Web's most comprehensive collections of technical boating information articles.

Related West Advisor Articles


Product Q & A