any experience adding a 4th axis to Leadshine mx3660 ?

Hello, I've build a three axis cnc mill using the Leadshine MX3660 and I'm very happy with it.
Now I'm trying to add a 4th axis to the MX3660 but I can't get it to work.

Anyone done this before or maybe someone can tell me what I'm doing wrong (maybe om reading the schematics wrong?)
http://www.cnczone.com/forums/attach...&stc=1&thumb=1

I've connected:
MX3660 to stepper driver:
(Output 1+) (DC+)
(Output 1-) (Pul +)
(Output 2+) (DC+)
(Output 2-) (Dir +)

For testing In Mach3 I have made it the Z-axis (since I know that was working) and set the Z-axis to Step pin10 and dir Pin11 (should be the output 1 and 2 pins on the mx3660)
no movement at all... what am I doing wrong?

(btw. I use the UC100 usb to parallel from cncdrive.com and really works great with the regular 3-axis setup so don't think thats the problem either...)

Really would appreciate any help on this!