Low beam loose connection
 

My left low beam is not working. I know it isn't the bulb since I once fixed it by removing the light out of the headlight then put it back in (don't get me started on how the freaken battery gets in the way) and it worked. Voila. BUT I don't know what I did to fix it. Can anyone tell me the wire I need to address since the low beam is not working again?

2000 VR6