my headlights don't come on all others do

Ricks answer above is your first probable solution .. If you still have problems I posted this on the page before this one , Maybe it will help .. Power lead for headlights , comes off starter solenoid as black wire , under positive battery connection . From there goes to Fuse block as both Black and Black/Yellow , My guess Black and Black/Yellow merge at alternator , Black/Yellow is feed side of headlight fuse , other side of fuse is Yellow/Red to headlight switch ... Red/Yellow from headlight switch goes to Dimmer Switch common and Red/Black goes to Low Beams and Green/Black goes to High Beams . There are many harness connections in between , but this should help...