Sierra MP41080 Marine Ignition Starter Switch – 4-Position, Magneto, Compact 5/8", 6-Screw + Boss, Push-to-Choke
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Sierra MP41080 Marine Ignition Starter Switch – 4-Position Magneto, Compact 5/8", 6-Screw + 1 Boss Terminal, Push-to-Choke
The Sierra MP41080 is a compact marine ignition starter switch built for magneto ignition engines that require a 4-position layout with push-to-choke and a mixed terminal configuration. The 4-position action — Accessory, Off, Ignition, and Start — lets you power onboard electronics independently before engaging the ignition. Push-to-choke is included, making this a complete solution for magneto engines that require choke control through the switch.
The terminal layout combines 6 screw posts with 1 boss terminal — a threaded stud connection used for a specific circuit (typically a solenoid or ground) that requires a ring lug secured with a nut rather than a standard screw-post connection. This mixed layout is found on specific OEM magneto wiring harnesses and is the key fitment detail to verify before ordering. A corrosion-resistant polyester housing with an inner cylinder seal keeps moisture out and prevents shorts. The compact 5/8" cylinder diameter and 7/8" mounting hole fit panels designed for the smaller cylinder format. Note: no boot is included.
Key Specifications
- Part Number: 11-MP41080
- Switch Type: 4-Position (Accessory – Off – Ignition – Start)
- Ignition Type: Magneto
- Voltage: 12V DC
- Current Rating: 15A
- Solenoid: 30A
- Cylinder Diameter: 5/8"
- Mounting Hole: 7/8"
- Terminals: 6 Screw + 1 Boss (threaded stud)
- Housing Material: Polyester (corrosion-resistant)
- Inner Cylinder Seal: Yes
- Push-to-Choke: Included
- Boot: Not included
Compatible Applications
- Outboard engines with magneto ignition systems requiring a 4-position switch with push-to-choke and a boss terminal connection
- OEM magneto wiring harnesses with a mixed 6-screw + 1 boss terminal configuration
- Marine helm panels with a 7/8" mounting hole designed for a compact 5/8" cylinder switch
- Helm setups with electronics requiring independent accessory power before engine start
- Direct replacement for worn or damaged OEM 4-position compact magneto ignition switches with boss terminal harnesses
Parts Desk Insights
The MP41080 is a precise fitment — choose it when your magneto harness specifically requires the 6-screw + 1 boss terminal layout with a 4-position switch and push-to-choke. The boss terminal is the key differentiator from other compact magneto switches in this family. If your harness uses all screw terminals and needs 7 connections, the Sierra MP41010 4-Position Compact Magneto 7-Screw Switch is the all-screw alternative. For a 3-position compact magneto switch with push-to-choke and 6 screw terminals, the Sierra MP41000 3-Position Compact Magneto Switch is the simpler option without an Accessory position. If your harness uses wire terminals rather than screw posts, the Sierra MP41070-2 6-Wire Compact Magneto Switch covers that configuration. If you need a boot for this switch, the Sierra MP39190 Replacement Ignition Switch Boot fits all Sierra polyester switches from 1996 and later.
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.