Is there a standard for chassis wiring in cases?
A. Disk Drive Power Connectors Yellow +12 volts Black (both wires) Ground Red +5 volts The color of front panel wires can be most anything, although some combinations are more popular among chassis manufactures than others (the plugs are usually labeled on recent, quality chasses). Likewise, there is some, not total commonality among the kinds of plugs used for the various wires; e.g., the speaker connector is almost always a four wire connector with the two speaker wires connected to the two outer positions (and they are usually red and black). Generally, if they are not labeled and you don’t have a diagram, you must physically trace the wires to see what switch, LED, etc. they are connected to and plug in the LEDs to determine which way they light. Plugging them in backwards will not hurt them. Plugging a switch into an LED header and closing the switch can damage the motherboard. See also: Determining Motherboard Front Panel Connectors Motherboard power connectors generally conform
