I have a 99 F350 Crewcab Diesel. Niether turn signals work. Flashers work and brake lights work. Any ideas?

 

Check fuse F23 under the dash. Otherwise, could be either the flasher relay or the MFS (or the wiring between them).

 

Thanks for your advice. I did check the fuse. Would you know where the relay is? And I'm not sure I know what the MFS. I don't have an owners manual.

 

MFS = multi-function switch. Translation of that; the turnsignal switch in the column. Also tilt the column up and down to it's extremes while trying the signals. Sometimes there are plugs that the wires are pulling on inside the column, and they work loose when the column is tilted.

 

I will try that. Because occasionally they will work. Thanks

 

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