1993 Other Isuzu Models turn signals

i bought this truck and two weeks later the turn signals quit working. the emerdency flashers still work but turn signals wont. i replaced a relay behind fuse panel and didnt work. is there another relay somewhere in this truck that runs turn signals only and if so where is it. i dont think its a turn signal switch cause ive never seen the contacts in the switch go bad at the same time. but im not an expert so i dunno. any anwers would be of great help thank you