If you've shorted Pin 5(ATX Pin16 Ps-On) on the 5x2Pin PSU outlet marked M/B with one of Pins 1,2 or 3 (ATX Pins 18,19 or 24 Ground) and not found any current with a multimeter when you turned the PSU on I would suppose the unit is not working.
If you do get them going, however, watch out for the different pinout between KM3 and KM X-series PSUs.
The M/B and IDE/SATA outlets are the same but the PCI-E and CPU outlets are the opposite way round.
On the KM versions the ground pins are opposite to the lug and the 12volt pins are adjacent to the lug on both the 4x2 CPU outlet and the 6x2 PCI-E outlets.
On the KM3 versions the 12Volt pins are opposite to the lug and the ground pins are adjacent to the lug on the 4x2 CPU/PCI-E outlets.
If you want to make up your own set of cables I did a pinout showing the differences here.