Automotive : negative ( ground ) side
Household : common ( hot ) side
the optical drive will connect to the power supply with a connector called molex connecter it is a 4 prong connector
P 12 Connector
SATA power connector is a type of power cable with which we can provide Disks power from the mother board. SATA Power cables are connected from sata point on motherboard to the drive.
It depends on what country and when the installation was made. This is because rules and regulations differ between countries and change over time. The black wire is in other words not always connected to the same thing. Contact a local electrician.
White or Black depending on the brand
Typically, CD-ROMs are connected using a power connector called a Molex Connector. A Molex Connector has four wires, two for power, the other two for grounding. This connector supplies two different voltages to the device it is connected to - 12v and 5v. For more information on Molex Connectors, see the article here: http://en.wikipedia.org/wiki/Molex_connector#Disk_drive_connector_.28AMP_Commercial_MATE-N-LOK.29
yellow in 12v red is 5v black in ground
the regular ATX has a 20 pin power connector, while the enhanced ATX power connector has 24 pin power connector.
The P1 power connector is the first ATX power supplies and motherboards used a single power connector. It also has 20 pins.
This car amplifier has a 9-pin connector. Power wiring: +12V = RED (fat cable) GND(Ground) = BLACK (fat cable) REMOTE = ORANGE (thin cable) Audio wiring, BLACK is connected to minus in this case. BLACK/BLUE = (both are thin) BLACK/WHITE = (both are thin)
Check the fuse for the cigar lighter. It supplies power to the OBD connector. It's under the Hood in the electrical centre .. a black fuse box above the driver side wheel
the black wire or yellow wire are not connected right