Hi Joshua -
I think a found a typo in the SII manual.
The third step on page 20 reads "Attach and solder the red wire connected to IA on the Shunt Regulator board to 34U."
I think that should be "Attach and solder the red wire connected to IB on the Shunt Regulator board to 34U."
The accompanying picture shows the wire connected to IB going to 34U. I followed the picture, as I expect most people will, because by the time you reach page 20 you've already soldered IA to 27U as per the instructions on page 19.
cheers,
Derek