Sierra MP51090 Mercury Ignition Switch 3 PositionSierra MP51090 Mercury Ignition Switch replaces Mercury Marine OEM Part # 87-17009A5.Features: Exact OEM replacement installation; Heavy duty potted construction; Minimal bleed per circuit; Molded umbrella type key; Push to choke; Maximum corrosion protection - eliminates oxidation; Inner seal between cylinder lock and contact plate; Non-conductive housing eliminates potential shorts; Specifications: Back Up Nut: Not Required; Face Nut: Hex Black Plastic; Hole Size: 7/8"; Length: Short: 5/8" maximum panel thickness; Material: Polyester; Rated Choke: 7 Amp @ 12v DC; Rated Ignition: 15 Amp @ 12v DC; Rated Solenoid: 30 Amp @ 12v DC; Terminal Type: 6 Color Coded Wire Leads/Potted; Switch Positions: Off - Run - Start; TYPE: 3 Position Magneto;