As Determined said, there is a separate power supply for the four ways. It starts with a 15 amp fuse connected to the battery buss bar in the fuse panel, then to the hazard flasher.From the flasher power goes thru the brown wire in the ribbon cable up to the turn signal switch. Turn signal power goes from the ACC buss bar thru the t/s flasher and the purple wire in the ribbon cable. Just an FYI, although I don't think it applies here, there is a third power feed to the T/S switch that comes from the stop light switch on a white wire.
Check the fuse clips in the fuse panel carefully. They are notorious for rusting and loosing spring tension if they have ever been overloaded. The wiring on these trucks was barely adequate for the factory installed lights. If the truck has ever had trailer lights connected to it, all bets are off, anything could be open, corroded, or melted.
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