i have no low beam or high beams
 

hello, im patrick 2001 f150, no low beams, no high beams, no fog lights. replaced multifunction switch, and the wiring harness to multifunction switch. replaced the head lights as well. was just getting high beams only... any suggestions for diagnosis?

Have you checked the fusebox for corrosion?

Hi Patrick, and welcome. I moved your thread to the electrical section because you should get more useful help here.

I'm sure the fog lights are on a separate fuse. Do the turn signals and parking lights work? I wonder if the headlights and fog lights might share a common ground? That connection could be faulty too.

- Jack

My suggestion is that you actual do some diagnostic work instead of just guessing and replacing parts.

Do you have a multimeter and do you know how to use it? If the answer is "no", then take it to a shop where someone who knows what they are doing can do the work.