99 w210 Left low beam - no power
 

After searching some threads, I haven't found this problem described herein, and I'm stumped.

My left low beam light is out. Changed the bulb. Nothing. Changed the fuse. Nothing. Put in a fuse I know to be good. Nothing.

Can't follow the wires too far under there, so where do I begin?

Thanks in advance for your help.

Get a meter, check for voltage at the headlamp terminals, if there is none there, work your way back until you find it.

yank that oval connector and clean the contacts. those space connectors
can shift and pop out on the headlight casing causing poor connection.