Sierra MP39760 3-Position Magneto Ignition Switch, Off-Run-Start, White, OMC 393301 Equivalent

The Sierra MP39760 is a 3-position magneto ignition switch built for marine control panels, cycling between Off, Run, and Start positions. It is constructed of polyester with a black plastic hex face nut and a plastic back up nut, and it mounts through a 7/8 inch panel hole in panels up to 5/8 inch thick. Electrical connections are made through 5 screw tab terminals plus 1 boss screw terminal, and the switch is rated for 15 Amps at 12 Volts DC on the ignition circuit and 30 Amps at 12 Volts DC on the solenoid circuit, giving it enough capacity to handle both ignition and starter solenoid switching duties on a single panel switch.

This switch is finished in white and cross-references to OMC 393301, making it a straightforward replacement for boat owners and technicians who need to swap out a worn or failing magneto ignition switch without hunting down obsolete OEM part numbers. Its screw tab and boss screw terminal layout is designed for simple panel wiring, and the compact 7/8 inch mounting hole matches standard marine dash and panel cutouts.

Specifications

• Brand: Sierra
• Manufacturer Part Number: MP39760
• Switch Type: 3 Position Magneto Ignition Switch (Off-Run-Start)
• Material: Polyester
• Panel Thickness: 5/8 inch maximum
• Terminal Type: 5 Screw Tab, 1 Boss Screw
• Back Up Nut: Plastic
• Face Nut: Hex black plastic face nut
• Hole Size: 7/8 inch
• Ignition Rating: 15 Amps at 12 Volts DC
• Solenoid Rating: 30 Amps at 12 Volts DC
• Color: White
• Item Dimensions: 1.62 x 4.87 x 7 inches
• Weight: 0.23 pounds

Replaces (OEM)

• OMC 393301

Frequently Asked Questions

What positions does the Sierra MP39760 ignition switch have? The Sierra MP39760 is a 3-position magneto switch that cycles through Off, Run, and Start positions.

What is the mounting hole size for the MP39760 switch? The MP39760 requires a 7/8 inch mounting hole and fits panels up to 5/8 inch thick.

Is the Sierra MP39760 an equivalent to an OMC part number? Yes, the MP39760 cross-references to OMC 393301, so it can be used as a replacement for that OEM number.

What material is the Sierra MP39760 ignition switch made of? The switch body is polyester, with a black plastic hex face nut and a plastic back up nut.

What color is the MP39760 ignition switch? This ignition switch is white.

How are the wires connected to the MP39760 switch? Terminal connections on the MP39760 are made through 5 screw tab terminals plus 1 boss screw terminal.

What is the amperage rating of the Sierra MP39760? The MP39760 is rated for 15 Amps at 12 Volts DC on the ignition circuit and 30 Amps at 12 Volts DC on the solenoid circuit.

How much does the MP39760 ignition switch weigh? The Sierra MP39760 weighs 0.23 pounds.

What are the overall dimensions of the MP39760 switch? Item dimensions for the MP39760 are 1.62 x 4.87 x 7 inches.

Can the Sierra MP39760 handle both ignition and starter solenoid switching? Yes, its dual rating of 15 Amps for ignition and 30 Amps for the solenoid circuit at 12 Volts DC allows the MP39760 to switch both loads from a single panel switch.

Does the MP39760 include mounting hardware? The MP39760 comes with a plastic back up nut and a black plastic hex face nut for panel mounting.