Not usually. Disconnect it and see what happens.
The first thing I would check would be the headlight fuses. (There may be one fuse per headlight.) Also, examine the headlights carefully for any damage.
If just one headlight quit working it probably burned out. If both headlights quit working at the same time the fuse probably blew.
Headlights,interior lights stop working.checked all fuses. I would suspect the headlight switch and/or the electrical connection at the headlight switch is faulty.
I would get a philips head screw driver. Then I would locate the screw on the headlight housing. I would then use the screwdriver on the screw as I needed.
The headlight fixture probably contains moisture on the inside. When the headlights are "on", the moisture clouds the light beam, diffusing the light.
There could be many reasons, but the first thing I would check is ARE BOTH HEADLIGHT STILL WORKING. As a tech I was once faked out till I found out there were 2 burned out headlights. Not always visibly dark bulbs.
I would replace the headlight switch as Ford has had their share of these problems.
it could be the headlight relay. if not it may be in the switch.
Check the headlight switch, if not it's probably a fusible link in the headlight circuit.
If they were wired in series, losing one bulb would leave you with no headlights at all, and that would be dangerous.
No, series circuits are not used in car headlights, because if one headlight were to go out the other would also, because the one light would make an incomplete circuit. Headlights are wired as parallel circuits because when one headlight goes out, the other is unaffected and stays as bright as it was before the other light went out.
iT CAN BE WIRING OR BAD HEADLIGHT SWITCH.