At Flasher:
White wire with green stripe at flasher should be hot with key on.. Is it?
Also If you press left or right turn signal the gray wire should flash power...does it? If the grey wire has power flashing good chance the turn light switch is dirty or bad as the flashing grey wire brings power back to the turn light switch. When you move the switch that determines left of right power.
Blue with Black must be grounded with either turn light active ...is it? (Almost has to be if the position lights are working as you describe. But won't hurt to check)..