The dims lights may not work on a Ford Focus if the switch is defective, the wiring is damaged, or the bulb has burnt out. If both bulbs are out, it is most likely within the wiring.
ford van 2013 E250 inide lights wont work
Most probably electrical problem caused to the light being down and collecting water. Replace lamp and will work again.
Windex and a paper towel does.
Check fuses-- common circuit
The brake light switch might not be connected properly. Remove the brake light switch for 10 seconds and replace it to its original position.
There may be something blocking the trunk.
Check brake lights--if they do not work shift interlock will not release
Your Ford Focus does not have Hooters.
check that you have double filament bulbs in tail lights
wiring harness to roof brake light has been fried. Brake lights don't work, cruise control doesn't work, unable to move shifter from park. Transit Connect 2010
there is a fuse dedicated to the running lights on the 96 Thunderbird. Check your fuse panel under the dashboard for the proper fuse and check to see if it is blown.
Try checking your grounds to make sure your wires are grounded properly. I had this problem on a 1983 Cougar one time. .