Mercury - CAN Data Harness (10-Pin, One Resistor) 15-Foot SmartCraft Lead 84-879980T15. Overview. Some SmartCraft setups need both a longer cable run and a built-in termination point, especially on bigger helms or when the network branches out across multiple modules. The Mercury 84-879980T15 CAN Data Harness provides fifteen feet of SmartCraft cable with one integrated resistor, giving the system the length it needs while also supplying the correct electrical load at that end of the backbone. I