I'm in the process of modifying a 360 power supply to power a 6 unit Motorola radio charger. I've got the +12v and the ground wired to live and ground on an NL-2 connector; and I've jumped the blue PS_ON lead to the +5v rail, as a few other mods have done. When I plug the supply in, I get power for an instant and then it shuts down. Nothing looks/smells fried, so I'm a little stumped. What am I doing wrong?