1991 Pontiac Lemans Front turn signal wiring

I changed the stereo in my 91 Lemans 2 door and seem to have caused a wire to the turn signals to become grounded somewhere. I am trying to find out what the colors are for the turn signal wires coming out of the directional switch so I can find the short and repair it. Everytime I turn the signals on the 10 amp fuze for them is blowing. I have replace the switch with a new OEM switch and still have the problem, this leads me to believe that there is a wire grounding somewhere under the dash. None of the wires hooked to the stereo have anything to do with the turn signals. Thank you for your help.