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Over 50 years of Trusted Marine Service

Sierra MP39760 Marine Ignition Starter Switch – 3-Position, Magneto, 12V/15A

Original price $47.29 - Original price $47.29
Original price
$47.29
$47.29 - $47.29
Current price $47.29
Item locally warehoused

Free returns on all eligible orders

You have 30 days to request a return. All sale items are final sale.

Sierra MP39760 Marine Ignition Starter Switch – 3-Position Magneto, 12V/15A

The Sierra MP39760 is a heavy-duty marine ignition starter switch built for outboard and inboard engines running magneto ignition systems. The 3-position action — Off, Ignition, and Start — gives you clean, positive control over engine startup and shutdown from the helm. A polyester housing provides maximum corrosion protection and eliminates the risk of shorts in the demanding marine environment, while an inner seal between the cylinder keeps moisture out of the switch mechanism.

The push-to-choke function and included boot make this a complete, ready-to-install solution. The 5/8" mounting diameter and 7/8" mounting hole fit a wide range of marine dash panels, and the 5-screw plus 1-boss terminal layout accommodates standard magneto wiring configurations.

Key Specifications

  • Part Number: 11-MP39760
  • Switch Type: 3-Position (Off – Ignition – Start)
  • Ignition Type: Magneto
  • Voltage: 12V DC
  • Current Rating: 15A
  • Solenoid: 30A
  • Cylinder Diameter: 5/8"
  • Mounting Hole: 7/8"
  • Terminals: 5 Screw + 1 Boss
  • Housing Material: Polyester (corrosion-resistant)
  • Includes: Push-to-choke, boot, lock and contact plate

Compatible Applications

  • Outboard and inboard engines with magneto ignition systems
  • Marine helm panels with a 7/8" mounting hole
  • 12V DC electrical systems requiring a 3-position Off/Ignition/Start switch
  • Replacement for worn or damaged OEM ignition switches on magneto-equipped engines

Parts Desk Insights

The MP39760 is the right choice when you have a magneto ignition engine and need a compact 5/8" cylinder switch with push-to-choke — common on older outboards and smaller inboards. The polyester housing is the preferred material for saltwater and high-humidity environments over brass alternatives. If your engine requires a larger 1-1/8" cylinder switch, the Sierra MP39100 Polyester 5-Screw Ignition Switch or the Sierra Magneto 6-Screw Polyester Ignition Switch are the larger-format equivalents. For a brass-bodied option in the 1-1/8" format, the Sierra MP39040 Brass Ignition Switch is available at a lower current rating (10A).

Shipping information

In-stock and OEM parts: ship same or next business day.

Locally warehoused items: ship within 1-3 business days.

Special-order items: timeline confirmed after order.

Returns & warranty

Returns & Satisfaction Guarantee

We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.

If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.

To qualify for a return:


  • Item must be in new, unused condition

  • Product must be in its original packaging

  • All parts, components, hardware, manuals, and accessories must be included

  • Packaging must be undamaged and suitable for resale

Important:

Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.

We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.

For return authorization, please contact our support team before shipping anything back.

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