Sierra MP39090 3-Position Magneto Ignition Switch, Push to Choke, White

The Sierra MP39090 is a 3-position magneto ignition switch built for marine helm panels, with Off, Run, and Start positions and a push-to-choke function for cold starts. The switch housing is molded from marine grade Polyester, a non-conductive material that eliminates the potential for shorts in wet, corrosive marine environments. An inner seal between the cylinder lock and the contact plate provides maximum corrosion protection and helps eliminate oxidation over time, which keeps the switch working reliably even after repeated exposure to spray and humidity.

The switch is finished in white and mounts through a 7/8 inch panel hole, fitting panels up to 1 1/8 inch maximum thickness. Hardware includes an anodized steel back up nut and a hex plastic face nut with a snap-on rubber cap to protect the terminals from moisture. Electrical connections are made via 6 screw tab terminals, and the switch is rated for 15 Amp at 12 Volts DC on ignition, 30 Amp at 12 Volts DC on the solenoid circuit, and 7 Amp at 12 Volts DC on choke. It is a universal fit switch, making it a straightforward replacement wherever a 3-position magneto ignition switch with push-to-choke operation is needed.

Specifications

• Brand: Sierra
• Manufacturer Part Number: MP39090
• Switch Type: 3-Position Magneto Ignition Switch
• Switch Positions: Off, Run, Start
• Operation: Push to Choke
• Material: Polyester
• Back Up Nut: Anodized steel
• Face Nut: Hex plastic face nut with snap-on rubber cap
• Terminal Type: 6 Screw Tab
• Hole Size: 7/8 inch
• Maximum Panel Thickness: 1 1/8 inch (Long length)
• Ignition Rating: 15 Amp at 12 Volts DC
• Solenoid Rating: 30 Amp at 12 Volts DC
• Choke Rating: 7 Amp at 12 Volts DC
• Color: White
• Weight: 0.26 pounds
• Fit Type: Universal

Fitment

Universal fit for panels with a 7/8 inch mounting hole and up to 1 1/8 inch maximum panel thickness.

Frequently Asked Questions

What are the switch positions on the Sierra MP39090? The MP39090 has three positions: Off, Run, and Start, with a push-to-choke function built into the switch for cold engine starts.

What size mounting hole does this ignition switch need? A 7/8 inch panel hole is required to mount the Sierra MP39090, and it fits panels up to 1 1/8 inch maximum thickness.

Is the MP39090 rated for both ignition and solenoid circuits? Yes, the switch is rated 15 Amp at 12 Volts DC for the ignition circuit, 30 Amp at 12 Volts DC for the solenoid circuit, and 7 Amp at 12 Volts DC for the choke circuit.

What material is the Sierra MP39090 switch housing made from? The housing is made from marine grade Polyester, a non-conductive material that eliminates the potential for electrical shorts in wet marine environments.

Does this switch include mounting hardware? Yes, the MP39090 comes with an anodized steel back up nut and a hex plastic face nut fitted with a snap-on rubber cap for weather protection.

What color is the MP39090 ignition switch? It is finished in white.

How many terminals does the Sierra MP39090 have? The switch uses a 6 screw tab terminal type for wiring connections.

Will the MP39090 fit any boat? The Sierra MP39090 is a universal fit switch, designed to work wherever a 3-position magneto ignition switch with a 7/8 inch mounting hole is needed.

How does this switch resist corrosion? An inner seal between the cylinder lock and the contact plate on the MP39090 provides maximum corrosion protection and helps eliminate oxidation.

What does push to choke mean on this switch? Push to choke means the MP39090 activates the choke function when the key is pushed in, in addition to its Off, Run, and Start rotary positions.

How much does the Sierra MP39090 weigh? The Sierra MP39090 ignition switch weighs 0.26 pounds.