Headlights Will not come on

I had that once. Turned out to be the headlight wirings grounding bolt had loosened some. The headlights are of course wired parallel and in my case the pair terminated in an I that was bolted to the radiator wall or whatever it is termed.

Where is the ground bolt located ?

June 15,2019 Hi trying to fix my left head light on 2010 chevy aveo. I purchase a new assembly because electrical melted. re wired it and installed a new bulb. so high beam and signal work but low beam still won't work.