SEACHOICE Marine 3-Position Brass Ignition Starter Switch — Heavy-Duty, Includes 2 Keys

The SEACHOICE 3-Position Heavy Duty Ignition Starter Switch is a brass, three-position off/ignition/start marine switch that provides a durable, OEM-style control for powering and starting boat engines.

This ignition starter switch is built for boaters who need a reliable, long-lasting master switch for new builds, refits, or replacement on existing panels. Constructed from brass for corrosion resistance and long service life, the switch accepts up to 1-inch panel thickness and comes with two keys for spare security. With three terminals and standard mounting dimensions, it fits common marine installations and delivers straightforward mechanical performance without extra electronics.

How does this switch fit into my boat’s electrical system?

The switch acts as the master control that connects battery power to the ignition and starter circuits. Its three terminals are arranged for clean wiring of off, ignition, and start functions so the starter engages only when the key is turned to the start position. The included mounting stem and standard threads make panel integration simple for most helm layouts.

• Three terminals: off, ignition, start for standard wiring
• Mounting stem length 1-7/32 inches with 13/16"–20 thread
• Accepts panels up to 1 inch thick
• Includes two keys for primary and backup use

What materials and durability features does it offer?

This starter switch uses brass construction for the body and mounting components to resist saltwater corrosion and mechanical wear. Brass provides a stable base for electrical contacts and keeps the assembly rigid under use. Heavy-duty internal components are designed to tolerate repeated key cycles typical in marine operation.

• Brass housing and mounting hardware for corrosion resistance
• Robust mechanical action for long cycle life
• OEM-style form factor for direct replacements

Will it install easily in my helm panel and what are the dimensions?

The switch is made for straightforward panel mounting: the stem threads into a 13/16"–20 hole and supports up to a 1" panel thickness. The 1-7/32" stem length gives enough engagement for secure fastening while leaving room for wiring behind the panel. Typical DIY or professional installers will find the dimensions match many common marine ignition cutouts.

• Mounting stem: 1-7/32 inches long
• Thread diameter: 13/16"–20 standard marine thread
• Max panel thickness: up to 1 inch
• Terminals: three clearly labeled connections for wiring

What comes in the box and how is it used day-to-day?

The package includes the ignition starter switch assembly and two identical keys so you have a spare. Day-to-day operation is as simple as turning the key to the ignition position to power electronics and accessories, and to the start position to engage the starter motor. When not in use, the off position isolates the ignition circuit for security and safety.

• Manufacturer part number: 50-11621
• Two keys included—one spare for convenience
• Simple key-turn operation: Off / Ignition / Start

Who is this for? The SEACHOICE 3-Position Heavy Duty Ignition Starter Switch is ideal for boat owners, marine electricians, and DIY hobbyists who need a dependable OEM-style replacement or a reliable component for new boat builds and refits. If you want a corrosion-resistant brass switch with common mounting dimensions, clear three-position control, and an extra key included, this unit provides a pragmatic, cost-effective solution that integrates cleanly into most small to mid-size vessels.