Turn Signal indicators stopped working

Turn signal indicators all stopped working suddenly. I checked the fuse and it is alright. I don't think all 4 bulbs can go out simultaneously. What else can be wrong.

I had the same problem with my 1995, I found that under the hood drivers side there is a set of fuses, the two fuses under there will say "DLR" and "Hazzard", the "Hazzard" which is a 10amp fuse for some reason it reads 12volts when the car is not running but as soon as I start the car the volts would drop and the signal lights & hazzard would not work. So I took a 12volt source from the battery and put it to the side which feeds 12volts to the "hazzards" and plugged the fuse back in. Solved my problem. Hope this Helps