ATX, WTX and other standard and proprietary power supply (PSU) cables connectors pinouts  > Apple pinouts
Pin Pin
Name
Description
1 Ground  
2 V+ 6.86 VDC idle
14.5, 16.5 or 18.5 VDC depending on load
3 LED connects to a 1-wire chip inside the connector, which controls the charging voltage and the LED status
4 V+

6.86 VDC idle
14.5, 16.5 or 18.5 VDC depending on load

5 Ground  

Outer frame is magnetized.

Connector can be used in either orientation.

5 pin Apple power connector layout
5 pin Apple power connector
at the MacBook
5 pin Apple power connector layout
5 pin Apple power connector
at the Cord
According to 22 reports in our database (21 positive and 0 negative) this pinout should be correct.

Is this pinout
Apple MacBook power connector (MagSafe) visual pinout:
Apple MacBook power connector (MagSafe) diagram
click to enlarge
Source(s) of this and additional information: http://en.wikipedia.org/wiki/MagSafe, http://fieldeffect.info/w/MagSafeOtomy
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