Sierra MP41020 Marine Ignition Starter Switch – 4-Position, Magneto, 12V/15A
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Sierra MP41020 Marine Ignition Starter Switch – 4-Position Magneto, 12V/15A
The Sierra MP41020 is a heavy-duty marine ignition starter switch built for magneto ignition engines that require an Accessory position. The 4-position action — Accessory, Off, Ignition, and Start — lets you power onboard electronics independently before engaging the ignition, making it well-suited for helm setups with chartplotters, VHF radios, or stereo systems on magneto-equipped engines. A corrosion-resistant polyester housing keeps moisture out and prevents shorts in demanding saltwater and high-humidity marine environments.
This switch is designed for magneto ignition systems — verify your ignition type and terminal count before ordering, as this family includes several closely related switches with different terminal configurations.
Key Specifications
- Part Number: 11-MP41020
- Switch Type: 4-Position (Accessory – Off – Ignition – Start)
- Ignition Type: Magneto
- Voltage: 12V DC
- Current Rating: 15A
- Solenoid: 30A
- Housing Material: Polyester (corrosion-resistant)
Compatible Applications
- Outboard and inboard engines with magneto ignition systems requiring an Accessory position
- Helm setups with chartplotters, VHF radios, or stereo systems needing independent accessory power before engine start
- 12V DC electrical systems requiring a 4-position Accessory/Off/Ignition/Start switch
- Direct replacement for worn or damaged OEM 4-position magneto ignition switches
Parts Desk Insights
The MP41020 is the right choice when you have a magneto ignition engine and need a 4-position switch with an Accessory position — use it when your helm has electronics that need to power up before you crank the engine. For a compact 5/8" cylinder 4-position magneto switch with 7 screw terminals, the Sierra MP41010 Compact 4-Position Magneto Switch is the smaller-format alternative. If you only need a 3-position magneto switch (no Accessory position), the Sierra MP41000 3-Position Compact Magneto Switch (with push-to-choke) or the Sierra MP39090 3-Position Magneto 6-Screw Switch cover that application. For a 4-position switch on a conventional ignition engine instead of magneto, the Sierra MP41040 Conventional 4-Position Switch is the correct fit.
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.