Sea-Dog Brass 3-Position Key Ignition Switch

The Sea-Dog Brass 3-Position Key Ignition Switch (part number 420350-1) is a purpose-built marine electrical component designed to manage power distribution and engine start functions on vessels of all sizes. Constructed from stamped brass for corrosion resistance in saltwater environments, this three-position ignition switch handles the off, ignition, and start operations essential to reliable boat operation. The 13/16-inch diameter long shaft fits standard marine panel installations up to 1-1/8 inches thick, making it compatible with both retrofit projects and new builds.

Electrical specifications reflect marine-grade requirements: ignition circuit rated for 15 amps at 12-volt DC, and solenoid circuit rated for 30 amps at 12-volt DC. Three screw terminals provide secure, accessible wiring connections that resist the vibration and corrosion inherent to boat environments. The switch includes two matching keys for crew access and convenience. Brass construction resists galvanic corrosion that aluminum switches experience in salt air, extending service life and reducing maintenance intervals. An optional rubber boot is available to further shield electrical connections from spray and moisture ingress.

Weekend anglers and serious offshore operators both depend on ignition switches that start reliably in all conditions. A failed switch leaves you dead in the water—literally. Sea-Dog marine ignition switches are standard equipment on commercial fishing vessels and center consoles worldwide because the brass-body construction and three-screw terminal design prove themselves through years of heavy use. This model suits small to mid-sized outboards, inboards, and auxiliary diesel engines where straightforward on-off-start control suffices.

Marine electrical components demand materials that withstand continuous salt exposure and vibration. Brass outperforms cheaper alternatives, which is why experienced boaters specify this switch by name rather than accepting generic knockoffs. The 3-position configuration—off, ignition (running), and start (cranking)—is the marine standard, making replacement straightforward and troubleshooting simple.