How to replace a 2001 ford focus headlight switch assembly

Do you know what a wiring diagram is for ? How to use a DVOM - digital volt ohmeter to test electrical circuit's ? None of the headlamps work ? hi or lo beams ? Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. Year , make , model an engine size. Under system click on lighting , then under subsystem click on headlamps . Click the search button then the blue link . Looking at the diagram i see fuse's light switch , multifuction switch , relay's - hi & lo an the headlamp assembly's .
Now watch this video
Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

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These details will help.
Thanks.

I would check for voltage at the headlight switch. Also look for a headlight relay in the box in the engine compartment.

if you or someone knows how to use a multimeter can safetly use one while you have them on to see if any current is getting to any headlights sockets where they are located. Also check the connections as well and the wires if they are not connected too.

Did you change the turn signal switch?

Open bonnet and u will see two 10 mm bolts on the top of the head lamp remove these then u will have to raise the vehicle to acces the other bolt underneath near the wing. Pull out the headlight and disconnect the multiplug and remove the lamp

headlight bulb or assembly? remove the fender splash shield lower retaining screw. Push the fender splah shield to inside. Remove the headlamp assembly lower retaning bolt. Remove the grille. Remove the head lamp assembly

check the hight beam switch and see if it is broken, when you pull on it to turn on the hight beams it should click if not replace the switch and your problem whould be fixed

there are more wires that you cannot see that are melted that is causing the problem. trace all of your wires, starting with the license plate light, all the way to the headlights