Help With 2001 Denali

[gatorman712003]

hello,

I have the left low beam out and have swapped bulbs with the side and that bulb works, and left side still does not work. I have checked all fuses nothing is burned out. I have followed the wires nothing looks bad. I just dont know what is wrong. Could it be the relay? or switch? or control module? what do you think?

thanks for any help.

[gatorman712003]

I have also checked and I have power to the fuse block and also to the plug. I still dont know why the headlight wont work all other lights work fine...