Mercury - Ignition Harness Non-DTS 14-Pin Engine Ignition and Gauge Wiring 84-896537T20. The Mercury Non-DTS Ignition Harness is designed for mechanical control setups that require a longer, uninterrupted wiring run between the helm and the engine. It is commonly used on boats with forward-mounted consoles or extended rigging layouts where shorter harnesses are insufficient. The 20-foot length helps eliminate the need for stacked extensions while keeping ignition and gauge wiring clean, intentio