Depends on the wiring loom you have. I guess an original one does not provide the connecting wires in the main loom because there was no brake light switch in 1969.
The 68-70 harnesses are one piece from front to back. The 71 on harnesses had a separate headlamp harness.
I used this one on my 1970 Commando:
https://www.classicbikeshop.co.uk/wiring-loom-harness-braided-norton-commandos-1968-69.html
and this shows a brown and a white wire going to a front brake switch.
However they quote the Lucas part number as 54956250 not 54954277.
Not so. I just finished rewiring my '69 'S'. The original harness had wiring for the front brake switch and the switch. This was a one owner when I got it and original owner did not replace the harness.Depends on the wiring loom you have. I guess an original one does not provide the connecting wires in the main loom because there was no brake light switch in 1969.
Yes, the harness for the Wipac Triconsul switch.Actually too, there is a separate small harness that goes to the switch on the left handlebar. As I remember it originates from the headlamp shell.