Ignition switch pinout question.

Trying to workout what the black/green wire on the ignition switch goes to/from, as it is apparently omitted in the FSM (1984).

I found that the Z32 uses the same switch assembly and it is shown in the Z32 FSM.

Z31 IGN.JPG

I was investigating installing a Bosch 30A relay as a starter inhibitor, and had planned on putting it on the black/yellow wire on the switch harness but then decided that the best hidden location was at connector 73M/4E interconnect of the B/W wire.

On my SS 820 I just have a hidden momentary switch ran in series with the clutch interlock, but the 84T doesn't use one.

However i am still curious what the black/green wire is used for.