Using a test light check for powers and ground at the headlight socket. you say the high beam works so that pretty much says the ground is good. if the low beam terminal has no power you will have to see if your car has a fuse for each headlight, as you don`t say the year make and model you have. if you have power then check the socket for corrosion or a loose connection.
Testimonial: "its a 2008 freightliner class m2. i replaced the wires with a new plug but still not working"
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