Mercury - CAN Data Harness (10-Pin, No Resistors) 15-Foot SmartCraft Lead 84-879969T15. Overview. Long SmartCraft runs need a clean, uninterrupted cable to keep communication steady, especially on larger consoles or boats with long rigging paths. The Mercury 84-879969T15 CAN Data Harness adds fifteen feet of non-terminated SmartCraft wiring, giving you the space to route the harness properly without straining the original cable. It carries CAN P, CAN X, and CAN H signals through the standard yel