Dell D220p 01 Power Supply - Pinout 2
Find the three live 12-volt rails and the ground pins.
For DIY use, many users cut the cable to access the internal wires. For high-current applications (over 6A), it is recommended to join multiple wires of the same type (e.g., all three whites for positive) to handle the 18A load safely. Dell D220p 01 Power Supply Pinout 2