Dell Precision T7400 (Late 2007) - Manual (Page 163)

Adding and Replacing Parts 163
DC Power Connector P5
DC Power Connector P7
14 COM Black
15 12 VA Yellow
16 COM Black
17 COM Black
18 COM Black
19 12 VB White
20 OPEN
Pin Number Signal name 18-AWG Wire
1 12 VD Yellow/White
2 12 VD Yellow/White
3 12 VD Yellow/White
4 COM Black
5 COM Black
6 COM Black
Pin Number Signal Name 18-AWG Wire
4 5 6
1 2 3
1 2 3 4