I used to work in a tire shop. A regular (Irene) whom is always rather irrate customer. She came in to have her tires de-aired, and to have "the fresh stuff put in". She didnt want any of that "old air". I so wanted to tell her that she is breathing air that is probably a million years already. I kept my mouth shut and the rest of the workers and I had a good laugh at lunch break.
Unscrew the turn signal arm on your steering column, get a small funnel, then pee into the funnel....liquid will get to the tank down at the bottom of the steering column just beyond the firewall.
Maybe you got brake light fluid mixed into your blinker fluid. Try using your 4ways and see if the lights blink, also check the brake lights, if they blink, your going to have to check the shuttle valves, you may have a bad one that is allowing cross contamination. Then your going to have to drain and flush the systems.