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Amiga Technical ReferencesStandard 4-Pin Power Connector
This connector is pretty much standard with any computer peripheral. You will notice it mainly on floppy drives, hard-drives, tape drives and in some cases, a fan.
This is what it looks like if you are looking at a cable coming FROM a power supply.
If you want the pinouts for the connector on the peripheral, reverse the order.
To be sure, use a volt meter.
1 +5VDC 2 Ground for +5VDC 3 Ground for +12VDC 4 +12VDC