Mercury - CAN Data Harness (10-Pin, One Resistor, Non-DTS) 20-Foot SmartCraft Lead 84-879981T20. Overview. Some SmartCraft setups need more reach than the standard harness allows, and they also need a proper termination point built right into the cable. The Mercury 84-879981T20 CAN Data Harness covers both. With twenty feet of blue-connector SmartCraft cable and a single integrated resistor, it provides a long, clean run for CAN P communication while giving the network the correct load on one en