There is a small problem with power supplies #G27894 thru G29655 when used with a 32/8 and a MB32.

When you power the board on the caps in the meter brige are not charges and the power supply sees this as a short on the 18V line and shuts down the 18V rail.
Powering off and back on will fix this problem!
There is a Mod that involves clipping a resistor that corrects the problem