[Steeveedee]

The yellow wire runs from the "R" terminal to the coil hot side. I stripped it completely out of the harness when I went to HEI, because a nonexistent wire won't get connected by accident somewhere else. I do my own work, but you never know. The truck could have a problem while the wife is driving it, and some animal could get in there and monkey around.

You could pop the ignition switch apart and look at the contacts, since you're replacing it. That might give you an answer.