Mercury - Ignition Harness Non-DTS 14-Pin Engine Ignition and Gauge Wiring 84-896537T11. The Mercury Non-DTS Ignition Harness is designed for mechanical control setups that require additional reach between the helm and the engine without excessive cable length. Its 11-foot design makes it a practical choice for mid-size boats where shorter harnesses may pull tight and longer harnesses create unnecessary slack. This balanced length supports clean, intentional routing for ignition and gauge wiring