Dell Precision T7400 (Late 2007) - Manual (Page 166)

166 Adding and Replacing Parts
DC Power Connector P22, P23
DC Power Connector P24
6 COM Black
7 COM Black
8 3.3 V Orange
Pin Number Signal name 20-AWG Wire
1 12 VA Yellow
2 COM Black
Pin Number Signal name 18-AWG Wire
1 12 VE Blue/Yellow
2 12 VE Blue/Yellow
3 12 VE Blue/Yellow
4 COM Black
5 COM Black
6 COM Black
7 COM Black
8 COM Black
Pin Number Signal name 18-AWG Wire
1 2
5 6 7 8
1 2 3 4