I would check the bulbs, first with just parking lights on - making sure all light - then to see if brake lights work.
If brake lights work, check you parking/signal lights, as they may be of the "two filament" variety. If this is the case, and they are not burned out, check to make sure that the FLASHER module works and that the button for the EMER FLASHER works.
If either is not working, neither will your turn signals, as they depend on the flasher module.
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The problem could be in one fuse, bad ligth bulb, bad combination switch wich is the turn signal lever siwtch, or the combination of all this. Is the front left turn signal working, in order to find out if the turn signal switch is working check for power at the the cable in the corredpondent connector that way you eliminate the posibilty of the turn signal sitch if you have power at the connector also do the same at the stop ligth if there is no power you have problaby bad fuse, hope this help tou out.
There is a turn signal flasher under dash...most have a flasher for the emergency signals and one for the turn signals...some have one flasher....but check fuses first...normally it is fuse burnt...if you can locate the flasher normally they will get abnormally warm when bad......it should look like a round or square silver shiney or black cube.........if these are good with ign.on hold turn signal lever down firmly ...if it works replace turn signal unit.....if none of this works you have to troubleshoot wiring...
...normally yellow wire is left turn and green wire is right turn...black or white is ground red is stop light....but normally it is a blown fuse or flasher.
I have found a lot of these turn signal switches bad but check fuse 27 if ok This is a tip turn key one and put turn signal switch in the left or right postion, then push and release the 4 way switch at least 10 times if at any time the turn signals start working while the 4 way switch is off the turn signal is bad. What happens is the contacks in the switch pit and buy working the 4 way switch a bunch of times it scraps through the pits. If they do start working change the switch this isn't a fix its just an easy way to pin point a common problem. If that did work here are the complete test.
The emergency flasher switch is also the turn signal flasher It pops out of the dash and can be replaced easy. do chaeck the fuses before going to this much troble. check all the fuses as some work backup circuits that you wouldn;t think would be important. Before replacing the flasher switch ( you may only be able to buy it from the dealer) work the switch several times and the flashers will come on cheak to see if allthe lights work thenturn the flashers off and see ( with the key on if the turn signals now work. Now if during the test with the four way flashers you see a bulb or more out you know that the turn signals wouldn't work, but the four ways will. they work on different fuses so chak the turnsignal fuse too. after cycling the switch try the turn signals again as the switch is likly to stick and sometimes cycling it will get the turn signals working again. Fooling around with the switch you may find a position that the turn signals work. if you can't get it to stay working then you'll have to change the flasher emergency switch.
If both Signals are failing and you still have 4 way signals, it is probably you turn signal unit on the column used to activate them. If the Emergency Flashers don't work either it is most likely the Flasher relay. This is located either on one of the vehicle Fuse panels or on the turn signal power wire under the dash.
Your F--150 has 2 flashers, emergency and turn signal. Both are mounted on the fuse block under the dash. The turn signal flasher is mounted on the front of the fuse panel, the emergency flasher is mounted on the rear of the fuse panel. so replace the turn signal flasher should solve the problem. Let me know how it goes.