If the turn signals still do not work after that, move on to the turn signal switch. The switch grounds to the steering column, so check that the bracket on the assembly or the worm clamp that holds everything to the steering column has a blank contact surface (you see what I mean when you look at it). If still no go, remove the turn signal switch, open it up (be ready for a little spring to jump out) and gently clean/refresh the contact surfaces with electronic cleaner and emery cloth. Reassemble and try again. If still no dice, fork out $45 for a new flasher control box. Yes, you can perhaps repair the old one - there is a thread on it - but you be the judge whether the work involved is worth it for you.