Hi There,

If everthing looks fine with the fuse and wiring then try getting a wire and briefly shorting the metal tip of Q42 (on the driver board) to ground (one  of the board mounting screws will do), if the flashers come on then more than likely you have a dodgy transistor (TIP102), if not then you have a wiring problem, maybe the power wire that runs to the flashers has come off somewhere, good luck