Ok,
I found a parallel cable with all 25 wires, used ground pins (18 to 25) on the negative terminals, and as expected... it works
Thanks Brian
Fernando
BTW, these drivers are the chinese drivers that connect to 110v ac, so no need for power supply, at that voltage they put out about 135volts DC, and they max out at 7.5amps(dip switch selectable),, and the stepper motors are a mamoth 37 Nm holding, and weigh about 45 lb each.