Electrical Trouble

I did have linkage rods adjusted on the tranny so the car would shift better at a transmission shop about two weeks ago. So I jacked the car up pulled the harness foor the nuetral safety switch. Checked the switch it was tight and the terminals were good. Ran a wire to bypass the NSswitch and nothing so I assumed it was not the switch. I put the harness back on. Let the car down and it fired right up.Could the harness been loose the whole time or am I grasping at straws?