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Hi, have you removed the jumper from J7 header?
from the uZeus Manual:
Using the –12V Rail:
The –12V rail uses a switching regulator. This switching regulator needs to have
a minimum load of 100mA (out of 500mA) at any given time. The uZEUS has a
factory setting to self consume this current. If your uZEUS is powering more
than four (4) analog modules you can then disable this setting if desired to
make this 100mA available for use by your modules.
While the uZEUS is not powered look for header J7 (located below the blue
resistor) and remove the jumper. Re-insert the jumper such that it comes in
contact with only one pin. Once reinstalled in the system, the uZEUS will
provide the full 500mA of –12V power for your modules.