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You have a bad flasher,go online type in google images ford blinker flasher so you will see what the look like.its located under the drivers side steering wheel probably in the fuse box pull the old one out replace it with a heavy duty flasher problem solved
The first thing is to replace the flasher, the 4ways and signals use diffrent flashers, after replacing the flasher or changing it with the 4way flasher and see what happens. if this doesnt help then you may have a bad signal switch, a good trick is to turn on the signal and watch it as you move the lever around, pull back a little or lift it more and pull down a little, sometimes the switch contact goes bad and by moving the lever without take signal off will make it flash and if that happens then the signal switch is bad even if the 4ways work this still means a bad switch, the 4ways are wired through diffrent contacts then each signal, good luck.
under the dash is a blinker solenoid. it constantly clicks when the turn signals are on. could be bad. Does the four way hazards work? if they do then it will be your turn signal switch (the handle you use to turn on the turn signals.) I've been a mechanic for 10 yrs. Hope this helps
Test the circuit board wires on the back side of your taillights where the bulbs go in to see if power is going there with the blinker on, if yes replace the circuit board (quite common with these trucks). If there is no power back there check your flasher relays for each turn signal, assuming they dont click off and on when you tip the turn lever. if all else fails, head for the multifunction switch behind your steering wheel inside the column that your turn signal/wiper/cruise control lever is connected to.