What a great site this is!!!
Here is my problem. The ignition key in my 96 Bravada/Blazer won't turn all the way back to the off position so the key can be removed. I found that there is a small solenoid in the column that prevents this unless the vehicle is in park. I have replaced the solenoid but that wasn't the problem. There must be a switch somewhere that activates this solenoid that I can't find. Does anybody have any idea where I should look next? Is there a switch in the floor shifter or in the transmission that activates this solenoid or am I barking up the wrong tree entirely.
Thanks for all of your help.
Dan

Do not know if this will help but, my 93 S-10 went through this just 4-5 months ago. I had to replace the ignition key switch assy. Just worn out and needed replacing. The switch in the column was fine as was linkage etc.

Same thing happened to me while it was running. Had to replace the ignition lock.