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check the flasher relay, should be located on the fuse block. there should be two relays, one for the flashers and one for the turn signals. flasher relay could possibly on the back side of the fuse block. i haven't checked on my truck yet.
also check your fuse.
My switch is going bad. Sometimes the hazards don't come on until I wiggle the switch a little. It pulls and pushes to the column smooth, but there is a problem with the connection somehow. If your fuses are good, might be the switch.