Shorting out headlights

I have a 1991 Mustang GT.  For some reason, the multi function switch on the steering column keeps shorting out, causing my headlights to be unusable.  The high beams still work, but the headlights don't.  Someone told me that the magazine ran an article about it.  I was wondering if anyone could help with this problem.  

I am currently in this same predicament?. I even brought new bulbs. But its like you said?. High beams work and low beams dont?.. What did you do to fix it?. I have goten a dozed different stories?..  

I had the problem long ago. Do you have fog lamps, if you do try replacing the plug in side will probably be melted or burnt.  

I have a similar situation,

The LIGHT swith of My 1991 is original and i CANNOT turn off the signal parking lights that are in the front of the car. It looks like the switch is broken. I am planing to buy the following parts.

1987 - 93 GT Headlight Switch With Fog Lights - NOS
1987 -93 Replacement Head Light Switch Plug with Fog Lights

My question is how do I install this switch in my dash?

Is it very dificult to install?

Are there any instructions I can get in how to fix this matter?

Does anybody know someone close to Miami FL. that i can take my car to?

Or does any body out there have an idea what can cause this problem?

I live at Miami florida, and the only people that I trust working in the car is at Ford, but they are charing to mutch( about $120. an hour).

Im desperate and need help,

thanks
Carlos from Miami, Fl.  

i own a 1990 gt 5.0 , when i run my fog lamps with my head lamps after about five min, the head lamps go out , i replaced the switch ,but didnt cure problem ...