1998 Buick Regal Ignition Switch

I am having trouble with my car stalling when I put on my turn signals. Also, all of the dash lights go on and my speedometer goes crazy. Before I turn on my car and I put the turn signal on the car will not start. I originally thought it was my turn signal switch which I did replace. My car is still doing the same thing. I order a ignition switch which I told the car parts store what I needed and they order me the wrong part. I think I need the ignition switch that has the large black wire that goes under the dash. What is the difference between the ignition switches and do you think that will solve my problem?