Mercury - CAN Data Harness (10-Pin, No Resistors, Non-DTS) 20-Foot SmartCraft Lead 84-879968T20. Overview. Longer helm layouts and deep rigging channels sometimes need more reach than the standard SmartCraft lead can offer. The Mercury 84-879968T20 CAN Data Harness gives you twenty feet of clean, non-terminated SmartCraft cable using the blue 10-pin connector-built specifically for CAN P networks that don't use DTS. With no extra branches or circuits, it's a simple extension that helps the data