I've seen posts in this forum about this topic but they did not seem to cover my case. The current build manual section 12.9 Z-Axis Cables in the BigBox Printer Sub-assemblies section shows a four conductor red black blue green cable with no twists and a bare wires on one end and a description of a way to "fix" the cable by adding twists and eventually connecting the bare ends to the Rumba. I don't have a cable that looks exactly like this - all of the cables in my motor box have connectors, no bare ends. BTW I'm building a Big Box Dual Titan - I am not updating an existing Big Box. If you've worked out the correct instructions for this section 12.9 I would love to have it. Which of my motor cables (below) are the Z-Axis cables? Thanks Photo of my motor cables:
Complete the list, left middle is for Y axis motor, the three on the right side are two for extruder so and one for X axis motor...
Apparently they have corrected the z axis cable since writing that step, the Y shaped cable Alex pointed to is the correct one.