I have a 88 k1500, the blinkers stay solid when I flip the switch up or down. Occasionally they will will blink but when I slow down they go solid if they blink at all. I can still manually click them. My hazards work. What's weird is that if you turn the key to where the lights on the dash come on, but not so far that the truck is cranking, the blinkers will blink like they should. As soon as you turn the truck on they stop working. The cruise also doesn't work. Idk if that has something to do with it or not.