The most likely fault is going to be the wiring into the headlight unit where it can get cut by the edges as it goes in. Also check where the wiring comes around the headstock as that is prone to cracking the insulation due to the flexing as the steering is turned.
I’d have to look through the wiring diagram to find out more though. I am assuming the headlight bulb is OK and not blown and shorting inside (it happened to me recently).
