Try the fuse's they DO go bad from time to time an you may have more then one. Good Luck and Remember.
Change Your Mind, Not Your Oil.
Use the First In Synthetic Motor Oil's.
See My Bio For Information & Contact Details.
Is your headlight switch and blinker switch the same? If so, this is called the combination switch. Sounds like it is bad and needs to be replaced. Not uncommon for these to break.
The switch or the relay, check the cheapest, or simplest thing first, which could be the relay, but the symptom points more to the switch.
To find the cause of the low beams not working, start with the bulb to make sure both are ok. Check the dimmer switch, and the wiring from the switch to the headlights.
They stay on cause they runnin off the battery. there should be a car headlights switch somewhere by your spedometer stuff...
If by "dim headlights" you mean low-beams... the bulbs are bad and must be replaced.
faulty wiring or you are accidentally hitting the switch and not realizing it
headlight switch is probaly your trouble
I would replace the headlight switch as Ford has had their share of these problems.
blow fuse, bad motor, bad switch or wiring
replace the head light switch
bad headlight switch.
Chances are its your headlight switch if the fuse is good. It can also be your dimmer switch.