Hi all Quick question about my psu. Ive got a perspex case and been getting really sick of seeing thousands of red black and yellow wires running all over the place from my psu. So i got a wire sleeving kit. Its one of those that expand so you can get it over the wires. Alls well exept the dont fit over the molex connectors. So i got a molex remover to finish the job. My question is its gonna be easy to get the 2 black negative wires mixed up when putting then back into the molexes. So does it matter which way then go back ?????? ie if one is the -12 volt would it blow my psu and comp if it accidently went into the -5 volt space on the molex? I cant really see a way of doing it its a bit hard to trace the wires back to the psu once there all in sleeves and if i mark them with something i cant get them to slide through the sleeving. cheers guys

Why don't you just wrap a piece of tape around one of them?

The 2 back wires are not negative, they are ground (0 Volt, refference), they are one and the same; so it doesn't matter if you mix those 2 up. The red marker is 5 Volt and the yellow marker is 12 Volt. So, facing a disk drive (ie HDD< CR-ROM, DVD-ROM an so on) on the power connector you have 5V (red), GND (black), GND (black), 12V (yellow) And one more thing: when looking at the power connector and the ATA connector (if using paralel ATA, NOT SATA) Red goes in the interior. That means that the 5V wire and pin number one (marked red in the ATA connector) are one near the other. Hope this was the answer you were looking for. Alex.

thanks guys thats exactly what i was looking for and yeah alex my mistake i meant ground not negative. But i was still wary if the ground wire for the 12 volts rail had to go back to the 12 volt rail. I thought if a 12 volt supply was heading back to the 5 volt ground would it cause havoc with my psu. But you set my mind at rest. but thanks for the amazingly quick reply ill let loose with my sleeving and see if i can get the job done lol.

Some ground planes are isolated. This may not be the case for a PS. But if it is isolated, putting it in the wrong place will not work. I have never seen a PS schematic to know whether the planes are isolated or not. That's why I suggested using the tape.