I'm installing my first set of Suntour barcon shifters - the ratcheting model - and am having an issue and thought I'd see if anyone has suggestions. Of course, I could just be an idiot also.

I have installed the cables and attached them to the derailleurs. The front seems to pull the front derailluer fine but when I move the rear shifter for the rear the rear derailleur won't move to a lower gear. I've installed with the shifter in the down position, but I'm not sure exactly how these ratcheting shifters work.