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I take it you have checked the easy stuff like the fuse, replace just not looked at it, and the flasher.
There are 2 flashers, 1 for the turn signals and the other for 4 way.
You can swap then to test.
If you have done that and still workie then I say yes just replace them.
Oh if the truck has been sitting the turn signal contacts get a funk on them.
Try spraying electrical contact cleaner on the switch and move it a bunch of times and see if that works.
Dave ----
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