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All my lights are working on my F250 Heavy Duty Desil. But for some reason the blinkers are not working. The bulbs are good. Just put in new flasher & fuse. Can't figure out what is going on. Any suggestions?
Sounds like your multifunction switch is out, or you have a bad ground for the circuit.
Check to see of your brake lights are out too. The rear brake lights I believe go through the multifunction switch. The high mount brake light(dedicated brake light) does not. If you have the dedicated brake light and no other brake lights , It's one of the the problems mentioned.