03 truck turn signals wont work

[hopkinschevelle]

when i first bought my truck the turn signals worked intermitantly. Almost always in the morning they wouldnt work then id get off work and they would work all the sudden.

I had called the previous owner to see if there was something i needed to know about it and he said just to blow some dust cleaner in the fuse box. Never helped the problem.

Anyone have any ideas what could be keeping my turn signals from working. They dont work at all now.