I own a 1999 F250 super duty super cab that the blinkers stopped working. I replaced the switch today. The good news is that I can flash and have high/low headlights and hazard flashers. Bad news no blinkers! Yes, I have checked the bulbs they are fine, I checked the fuses. The only thing I have not checked is the hidden relay(s). Does anyone have any ideas?

 

Check fuse F23 under the dash, followed by the flasher relay, then the wiring up the steering column to the MFS, especially if you have a tilt column.

 

That wasn't the problem. It has to be the relay. The big blue one right? Or is it one of the small black relays?



















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The OEM flasher relay is blue.

 

Turn your hazards on since they work and find the clicking. The same relay does both functions.

 

OK. Since it does both will it malfunction so that the turn signals do not work? Asking causes my flashers work.

 

The relay is a two-in-one unit. It is possible for on half to work but the other doesn't. That is why you need to verify the power feed from the fuse I told you about first.