Ignition Switches

Sierra Ignition Switches are covered by Sierra’s Industry Leading Warranty. Learn More
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Sierra offers the most complete selection of high quality polyester and brass ignition switches for the marine industry.

Marine grade glass filled polyester blend switches feature:

• Maximum corrosion protection – eliminates oxidation
• Inner seal between cylinder lock and contact plate
• Non-conductive housing eliminates potential shorts
• 20 Amp rating
• 2, 3 and 4 position switches
• Switches for magneto and conventional ignitions

Brass ignition switches feature:

• Corrosion resistant construction
• Up to 15 Amp rating
• 2, 3 and 4 position switches
• Switches for magneto and conventional ignitions

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2 POSITION CONVENTIONAL
3 POSITION CONVENTIONAL
4 POSITION CONVENTIONAL
3 POSITION MAGNETO
4 POSITION MAGNETO
WORLD OUTBOARD MOTORS
FACE AND BOOT NUTS

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WIRE COLOR CODES

Red Black Yellow with Red Stripe Black with yellow stripe Purple Yellow with Black Stripe Purple with white stripe
Battery Magneto Ground Solenoid Magneto Ignition Choke Accessory

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2 POSITION CONVENTIONAL

MP39010MP39010

OFF-ON Use with separate starter button
MP39010 – Clamshell package
MP39012 – Bulk (100pcs)

DESCRIPTION
Material Brass
Length Short: 5/8″ maximum panel thickness
Terminal Type 2 Screw Tab
Back Up Nut Brass
Face Nut Hex Chrome Face Nut
Hole Size 3/4″
RATED
Ignition 5 Amp @ 12v DC

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MP39020MP39020

OFF-ON Use with separate starter button
MP39020 – Clamshell package
MP39022 – Bulk (100pcs)

DESCRIPTION
Material Brass
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 2 Screw Terminal
Back Up Nut Brass
Face Nut Hex Chrome Face Nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC

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MP39820-1MP39820-1

OFF-ON Use with separate starter button
MP39820-1 – Clamshell package
MP39822-1 – Bulk (100pcs)

DESCRIPTION
Material Brass
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 2 Screw Terminal
Back Up Nut Brass
Face Nut Knurled Chrome Plated w/rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC

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3 POSITION CONVENTIONAL

MP39060-1MP39060-1

OFF-RUN-START

MP39060-1 – Clamshell package
MP39062-1 – Bulk (100pcs)

DESCRIPTION
Material Brass
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 3 Screw Tab
Back Up Nut Brass
Face Nut Hex Chrome Face Nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC

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MP39080-1MP39080-1

OFF-RUN-START
MP39080-1 – Clamshell package
MP39082-1 – Bulk (100pcs)

DESCRIPTION
Material Brass
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 3 Screw Tab
Back Up Nut Brass
Face Nut Knurled black plastic w/rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC

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MP39120MP39120

OFF-RUN-START
MP39120 – Clamshell package
MP39122 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 3 Screw Tab
Back Up Nut Brass
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC

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MP39780MP39780

OFF-RUN-START
MP39780 – Clamshell package
MP39782 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Short: 5/8″ maximum panel thickness
Terminal Type 3 Screw Tab
Back Up Nut Brass
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC

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MP39200MP39200

OFF-RUN-START
MP39200 – Clamshell package
MP39202 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 3 Screw Tab
Back Up Nut Brass
Face Nut Knurled black plastic w/rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC

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MP39770MP39770

OFF-RUN-START
MP39770 – Clamshell package
MP39772 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 3 Blade
Back Up Nut Brass
Face Nut Knurled black plastic w/rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC

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MP41030MP41030

OFF-RUN-START
MP41030 – Clamshell package
MP41032 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Short: 1 1/8″ maximum panel thickness
Terminal Type 3 Screw Tab
Back Up Nut Brass
Face Nut Knurled black plastic w/rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC

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4 POSITION CONVENTIONAL

MP39700MP39700-1

OFF-RUN-START
MP39700-1 – Clamshell package
MP39702-1 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 4 Color Code Wires
Back Up Nut Brass
Face Nut Knurled black plastic w/rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Accessory 15 Amp @ 12v DC

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MP39800MP39800

OFF-RUN-START
MP39800 – Clamshell package
MP39802 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 4 Blade
Back Up Nut Brass
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Accessory 15 Amp @ 12v DC

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MP41040MP41040

OFF-RUN-START
MP41040 – Clamshell package
MP41042 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 4 Screw Tab
Back Up Nut Brass
Face Nut Knurled black plastic w/rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Accessory 15 Amp @ 12v DC

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MP39070MP39070

OFF-RUN-START
MP39070 – Clamshell package
MP39072 – Bulk (100pcs)

DESCRIPTION
Material Brass
Length Long: 1″ maximum panel thickness
Terminal Type 4 Screw Tab
Back Up Nut Brass
Face Nut Knurled black plastic w/rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Accessory 15 Amp @ 12v DC

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MP41020MP41020

OFF-RUN-START
MP41020 – Clamshell package
MP41022 – Bulk (100pcs)

DESCRIPTION
Material Brass
Length Long: 1″ maximum panel thickness
Terminal Type 4 Screw Tab
Back Up Nut Brass
Face Nut Hex Chrome Face Nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Accessory 15 Amp @ 12v DC

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UN12140UN12140

OFF-RUN-START
UN12140 – Clamshell package
UN12142 – Bulk (100pcs)

DESCRIPTION
Material Die Cast Zinc
Length Short: 5/8″ maximum panel thickness
Terminal Type 4 Threaded Stud
Back Up Nut Die Cast Zinc
Face Nut Knurled Chrome Face Nut
Hole Size 9/16″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Accessory 15 Amp @ 12v DC

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3 POSITION MAGNETO

MP39760MP39760

OFF-RUN-START Push to Choke
MP39760 – Clamshell package
MP39762 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Short: 5/8″ maximum panel thickness
Terminal Type 5 Screw Tab, 1 Boss Screw
Back Up Nut Plastic
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Choke 7 Amp @ 12v DC

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MP41000MP41000

OFF-RUN-START Push to Choke
MP41000 – Clamshell package
MP41002 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Short: 5/8″ maximum panel  thickness
Terminal Type 6 Screw Tab
Back Up Nut Brass
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Choke 7 Amp @ 12v DC

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MP39740-1

OFF-RUN-START
For Outboard engins without choke circuit
MP39740-1 – Clamshell package
MP39740-1 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Short: 5/8″ maximum panel thickness
Terminal Type 5 Color Code Wires
Back Up Nut Plastic
Face Nut Knurled black plastic w/rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Accessory 15 Amp @ 12v DC

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MP41070-2

OFF-RUN-START Push to Choke
For Mercury  Control Box Applications
MP41070-2 – Clamshell package
MP41072-2 – Bulk (100pcs)
(Colors on switch wires match factory color codes)

DESCRIPTION
Material Polyester
Length Short: 5/8″ maximum panel thickness
Terminal Type 6 Color Coded Wire Leads/Potted
Back Up Nut Not Required
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Choke 7 Amp @ 12v DC

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MP41090

OFF-RUN-START Push to Choke
MP41090-1 – Clamshell package
(Colors on switch wires match factory color codes)

DESCRIPTION
Material Polyester
Length Short: 5/8″ maximum panel thickness
Terminal Type 6 Color Coded Wires
Back Up Nut Brass
Face Nut Knurled black plastic w/rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Choke 7 Amp @ 12v DC

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MP51090

OFF-RUN-START Push to Choke
MP51090 – Clamshell package
MP51092 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Short 5/8” maximum panel thickness
Terminal Type 6 Color Coded Wire Leads/Potted
Back Up Nut Not Required
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Choke 7 Amp @ 12v DC

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MP52000

OFF-RUN-START Push to Choke
MP52000 – Clamshell package
MP52002 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Short 5/8” maximum panel thickness
Terminal Type 6 Color Coded Wire Leads/Potted
Back Up Nut Plastic
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Choke 7 Amp @ 12v DC

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MP39090

OFF-RUN-START Push to Choke
MP39090 – Clamshell package
MP39092 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 6 Screw Tab
Back Up Nut Anodized steel
Face Nut Hex plastic face nut w/snap on rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Choke 7 Amp @ 12v DC

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MP39040

OFF-RUN-START
MP39040 – Clamshell package
MP39042 – Bulk (100pcs)

DESCRIPTION
Material Brass
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 5 Screw Tab
Back Up Nut Brass
Face Nut Hex Chrome Face Nut
Hole Size 7/8″
RATED
Ignition 10 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC

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MP39100

OFF-RUN-START
MP39100 – Clamshell package
MP39102 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 5 Screw Tab
Back Up Nut Brass
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC

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MP39830

OFF-RUN-START
MP39830 – Clamshell package
MP39832 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Long: 1 1/8″ maximum panel thickness
Terminal Type 6 Screw Tab
Back Up Nut Brass
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DC
Solenoid 30 Amp @ 12v DC
Choke* 7 Amp @ 12v DC
*Terminal to power separately controlled choke circuit

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4 POSITION MAGNETO

MP39710-1

OFF-RUN-START Push to Choke
MP39710-1 – Clamshell package
MP39712-1 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Short: 5/8″ maximum panel thickness
Terminal Type 7 Color Code Wires
Back Up Nut Brass
Face Nut Knurled black plastic w/rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DV
Solenoid 30 Amp @ 12v DV
Accessory 15 Amp @ 12v DV
Choke 7 Amp @ 12v DV

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MP39720-1

OFF-RUN-START
For outboard engines without choke circuit
MP39720-1 – Clamshell package
MP39722-1 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Short: 5/8″ maximum panel thickness
Terminal Type 6 Color Code Wires
Back Up Nut Brass
Face Nut Knurled black plastic w/rubber cap
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DV
Solenoid 30 Amp @ 12v DV
Accessory 15 Amp @ 12v DV

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MP41010

OFF-RUN-START Push to Choke
MP41010 – Clamshell package
MP41012 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Short: 5/8″ maximum panel thickness
Terminal Type 7 Screw Tab
Back Up Nut Brass
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DV
Solenoid 30 Amp @ 12v DV
Accessory 15 Amp @ 12v DV
Choke 7 Amp @ 12v DV

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MP41080

OFF-RUN-START Push to Choke
MP41080 – Clamshell package
MP41082 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Short: 5/8″ maximum panel thickness
Terminal Type 6 Screw Tab, 1 Boss Screw
Back Up Nut Plastic
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DV
Solenoid 30 Amp @ 12v DV
Accessory 15 Amp @ 12v DV
Choke 7 Amp @ 12v DV

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MP39730

OFF-RUN-START
For outboard engines without choke circuit
MP39730 – Clamshell package
MP39732 – Bulk (100pcs)

DESCRIPTION
Material Polyester
Length Short: 5/8″ maximum panel thickness
Terminal Type 7 screw tab
Back Up Nut Brass
Face Nut Hex black plastic face nut
Hole Size 7/8″
RATED
Ignition 15 Amp @ 12v DV
Solenoid 30 Amp @ 12v DV
Accessory 15 Amp @ 12v DV
Choke 7 Amp @ 12v DV

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WORLD OUTBOARD MOTORS

All Sierra World Outboard Motors Ignition Switches feature:
• Exact OEM replacement installation
• Ideal for DFI, EFI and MPI engines
• Heavy duty potted construction
• Minimal bleed per circuit
• Molded umbrella type key

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MP51090

3 Position Magneto
OFF-RUN-START Push to Choke
Replaces: Mercury 87-17009A5
MP51090 – Clamshell package
MP51092 – Bulk (100pcs)

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MP52000

3 Position Magneto
OFF-RUN-START Push to Choke
Replaces: Mercury 87-88107A5
MP52000 – Clamshell package
MP52002 – Bulk (100pcs)

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MP51010

Suzuki 2 and 4 Stroke Outboards
Replaces: 37110-99E00
Colors on wires match factory color codes

MP51010 – Clamshell package
MP51012 – Bulk (100pcs)

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MP51020

Yamaha Control Box 2 and 4 stroke
Replaces: 703-82510-12-00
Colors on wires match factory color codes

MP51020 – Clamshell package
MP51022 – Bulk (100pcs)

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MP51030

Yamaha Dash Mount 2 Stroke, Dual Engine Application
Replaces: 61B-82510-01-00
Colors on wires match factory color codes

MP51030 – Clamshell package
MP51032 – Bulk (100pcs)

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MP51040

Yamaha Control Box 2 and 4 stroke, Push to Choke
Replaces: 703-82510-43-00
Colors on wires match factory color codes

MP51040 – Clamshell package
MP51042 – Bulk (100pcs)

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MP51050

Yamaha Dash Mount 2 & 4 Stroke
Dual Engine Application, Push to Choke
Replaces: 6K1-82510-06-00
Colors on wires match factory color codes

MP51050 – Clamshell package
MP51052 – Bulk (100pcs)
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FACE AND BOOT NUTS

MP39190

Weather Proof Boot Nut
Fits: All Sierra polyester ignition switches, 1996 & later. 13/16″-16 Thread. Rotating rubber seal. Seals out moisture and dust from lock cylinder

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MP39270

Facenut
For polyester ignition switches MP39100 thru MP39120. Nut has extra long threads for positive engagement on mounting bushing for early (Pre-1995) style with 13/16″-20 thread ONLY!

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