Check that the four way switch is working properly. If it doesn't return right to its "OFF" position, The turn signals won't work. Essentially the switch(4 way), cancells the turn switch.
Most important is to let us know what you find. Chris

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.