Hello folks, I have a couple of spare psu's laying about. I want to convert one to a 12 volt power supply to charge R/C batterys. I have a new battery charger I bought to do this but it needs a 12v power source. I have a 350W antec psu rated at 20 amps. The psu works when I plug it into a main board and the 12v rail is fine. what I need to know is how to jumper the connector so I can use it as i get no voltage readings when its notplugged into a mainboard. thanks