how do u fix a blinker malefunction they turn on but dont blink

the bulb filaments are bad...you can verify this by putting the hazards on walking around the vehicle and see which bulbs need replacement~

there is a flasher about 1 1/4 cylinder with a couple of connectors 3, I think on the far side this can be found by putting it on and listening to the clicking~

normally near the fusebox, think it's the only round can in town there~

the reason they don't blink BTW is there isn't a load present as the filament is burnt, one or more of them~ my Toyota starts flashing rapidly on the one bulb that does work~

The battery ground is at fault. corrosion snuck in there at the dead of night like a ninja. then boom! out goes the lights. well in this case on goes the light and no blinky blinky. corrision in a can typical ninja M.O. urekia! mystery solved kind sir, now you have a nice day ya year.