Im not quite sure as to what flasher you are speaking of but if its the emergency flashers those are on the dash next to the clock.
If you mean high-beam flashers just flick the high beams instead...
Below the steering column to the left is the fuse box panel. To the left of that, under the plastic panel that the fuse box panel clips into is the relay board. remove the "pop-out" pieces of the...
do you mean the signal flasher? If so it is the large round aluminum structure located within its placement within the fuse box under the steering wheel.
Flasher location for the 1984 merc is in the fuse panal; most likely under the dash to the right of the steering wheel coluum. It's been a while since I owned this one.. If not in that location try...