I have just received my junction box (SM-JC40) and top 3 port connector (SM-EW90-A) and wired the whole system up with my SW-R671 bar-end shifters, and nothing happened.
I then substituted the 3 port connector and bar-end shifters with the standard SM-EW67 and normal drop-bar Ultegra STI units, and everything worked fine. Plugging the bar-end shifters into the satellite ports and they worked fine.
No combinations using the 3 port SM-EW90 connector resulted in any action at all.
Any thoughts?
Cheers, Rich