Removing the headlight lens cover the wire for the bulb holder got pulled.

Any ideas where the red wire pin goes?

Update,

I got off lucky. With a torch it was obvious where it had come out. I inspected the pin and it was whole. So with long nosed plyers i got it started and was then able to pull it the full way, felt the clcik of the tab.
Phew!  What doesn't kill you is just bidding it's time.