Joe, I read through the other post, sounds like you do have a real nightmare to trouble shoot.
I did notice that thread #16 indicated he had the same problem and it did turn out to be the turn signal hi/low beam switch on the column. Have you tested this yet?
I have the parts breakdown page for the steering column and it shows the Turn Signal Kit to be TS012
Here is a source
You should be able to check to see if it is shorting out