The fuse isn't your problem... it's your wiring. Either a shorted wire or a loose ground.
Need to know which light is blinking.
if it is out check fuse if fuse is ok you will need to replace it.
They need a better ground going to them. There not grounded good.
Short in the wiring.
The headlights in the Ford F150 may have stopped working due to a bad fuse or bulb. Check these and if it doesn't fix the problem visit a mechanic.
It'll be a fault in the wiring at the dip stalk but you could check if there is a fuse in the dip circuit of your car which has blown (There should NOT be a fuse) It is also just possible that the dip filaments are gone on both lamps.
the short wont be on the fuse you need to find out what is shorting out and causing the fuse to blow
The headlights work on a totally different relay than the parking and fog lights. The headlight relay or headlight fuse is usually blown when only the parking and fog lights work.
look for a blown fuse.
You could pull the fuse (s) for your headlights or disconnect your negative battery cable as a temporary " fix " if your F-150 doesn't have battery run down protection and shuts them off after 45 ? minutes . If I knew the year , I might be able to tell you the fuse numbers for the headlights
rewire them.
Duct tape