Mercury - Key Switch with Harness Non-DTS 14-Pin Ignition Wiring Assembly 896537K02. The Mercury Key Switch with Harness (Non-DTS 14-Pin) is designed for mechanical outboard applications that use a non-DTS fourteen-pin ignition connection. It is commonly selected during repowers or rewiring projects where a clean, updated ignition layout is desired. The integrated key switch and extended harness help keep wiring organized at the helm without forcing tight bends or rerouting existing connections.