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If both the blinkers and hazards are not working, check the fuse block for a blown fuse. Also see if your running and brake lights come on. If they do, and there is no blown fuse, try replacing the flasher unit, usually located either near the fuse block or in the glove box area.
Blinkers and hazards normally work on the same fuse. Sounds like the hazard switch has a problem.Get the hazard switch out and bridge the two connector wires to the switch. If the hazards then work the problem is in the switch.If it don't work you may have a problem in the wiring between the switch and the flasher relay.
Could be the wiring near the rear end of the bronco on the underside. my left rear blinker went out, so after tinkering with it for hours, I noticed the hazards and blinkers are seperate wires altogether. i'd get the blinker working and my hazards would be out. well i don't know if that helps at all, but thats what my problem was, trial and erroring my lights.
First check if the bulbs haven't got fused, then check the fuse for the blinkers, finally the alternator which is responsible for the blinking. Its contact points to be cleaned of any carbon coating..................sodeep