I will definitely be buying Barry's book! I was on here quite a bit during the early 2000's and Barry was SO very helpful to me (and I know to many others). Now that I have some time on my hands, I am back and was so sad to see of his passing.
Back to topic... I figured it out. On a whim, I reversed the +/- on the back of the TIU on those 2 outputs and now all is well. Apparently I need to color code them!
One last question now... the instructions say to remove TIU connections to tracks prior to upgrading. I upgrade the TIUs in place, so is removing the track connections really necessary?