Dell Precision T7400 (Late 2007) - Manual (Page 164)

164 Adding and Replacing Parts
DC Power Connectors P10, P11
DC Power Connectors P12, P13, P14, P15, P16, P17
Pin Number Signal Name 18-AWG Wire
1 12 VCDC Blue/White
2 GND Black
3 GND Black
4 +5 V Red
Pin Number Signal name 18-AWG Wire
1 +3.3 VDC Orange
2 COM Black
3 +5 VDC Red
4 COM Black
5 +12 VB White
Pin Number Signal name 18-AWG Wire
1 +3.3 VDC Orange
2 COM Black
3 +5 VDC Red
4 COM Black
1 2 3 4 5