Mercury - SmartCraft J-Box Terminator / Resistor CAN P Network End Termination 8M0210753. Overview. A SmartCraft network only works as smoothly as its termination, and missing or worn end resistors can create all kinds of odd faults-dropped data, flickering gauges, or unstable readings. The Mercury 8M0210753 J-Box Terminator/Resistor closes out the CAN P network the way it's designed to, giving the system the proper electrical load and a clean end point. It's a simple piece, but it keeps the ent