Re-assembling my 5 Pro after moving and found the attached harness. Where does it go? It is a 6 wire harness with a 6 pin/6wire connector on one end, and a short (5 inch) 6 pin to 3 pin adapter.
That connects a BitRunner or VFD spindle to the controller Spindle connection.
Thanks Will for your expertise. I thought it was from when I used to use a bit runner.
Note that the adapter will also be necessary for a VFD spindle.