Molex cable connector

Picture of computer molex power connector

Molex is the name of the company who develops computer and other related connectors and products. This term is also known as the Molex power connector, which is the connector shown in the picture and is what connects your computer power supply to drives and devices inside the computer. Below is a diagram of this connector with its four connectors as well an explanation about each of the pins.
Pin            Wire Color                       Signal
1                  Yellow                               +12v
2                Black                               Ground
3                Black                                Ground
4               Red                                    +5v

culled from http://www.computerhope.com/jargon/m/molex.htm

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