I am having some problems with my turn signals on my 1974 F350, they WON'T WORK! I would like to find a schematic for the truck side of the wiring to the switch. I have running lites and brake lites and hazard flashers but no directional signals or horn. There appears that there is no power coming to the switch for the horn wire and I don't know where the power comes from that feeds the turn signal switch. Any help would be much appreciated. Thanks

 

Power to the turnsignal switch for the flashers comes from the turnsignal flasher. In 72 it comes in on a blue wire, and 80-up it comes in on a lightblue wire, so I believe I am right in saying it will be a blue wire in 74. One side of the flasher should have power with the keyswitch on.