Dell Dimension 5100C - Manual (Page 45)

DC Power Connector P2
DC Power Connector P3
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17 COM Black
18 COM Black
19 COM Black
20 N.C. N.C.
21 +5 VDC Red
22 +5 VDC Red
23 +5 VDC Red
24 COM Black
*Use 22 AWG wire instead of 18 AWG.
Pin Number Signal Name 18-AWG Wire
1 COM Black
2 COM Black
3 +12 VDC Yellow
4 +12 VDC Yellow
Pin Number Signal Name 18-AWG Wire
1 +3.3 VDC Orange
2 COM Black
3 +5 VDC Red
4 COM Black
5 +12 VDC Yellow