Technical Help needed. Where the Hell did I unplug this?

[Sindreengen]

Hi!
Just finished timing belt and shifter cables. I seem to have unplugged this plug fron somewhere. Anyone knows where it was connected? Back of battery tray pictured.

 

[bugsymike]

Don't know off hand, usually you can offer wiring plugs up in a general area of their reach without, straining to see where they would logically fit.
I would say looking at the dirt on the yellow part, it may have not been plugged in anywhere anyway as once plugged into a socket that yellow part is covered.

 

[puntodeltathema]

Brake master cylinder level sensor - you're just about at the socket in the first picture!