turn signals stopped working... on 2003 Chevrolet Silverado 2500 HD

the turn signals stopped working and both sides but the four way flashers still work...could this be a switch problem on the column? i checked all fuses and light bulbs and all are good... confused

try checking the flashers (small silver cylinders)under the dash, there should be 2
1 more answer
I had the identical problem. Replacing the flasher unit on backside of interior fuseblock solved the problem. Easy fix but $90 part! It could be the turn signal switch, but try flasher first.