The interface that protrudes from the back of the drive has gold contacts on both sides. Near one end of the interface, there is a gap to accommodate the plastic divider on the connector.
Align the connector with the interface so that the plastic divider on the connector lines up with the gap in the interface, as shown below.
Make sure the cable connector fits properly onto the drive interface and then push it onto the interface.
Caution
If you do not correctly align the connector, you could severely damage your diskette drive when you push it in.
If you removed a hard disk drive from the vertical mounting position, go to step 6. If you did not, go to step 8 for instructions on connecting the power cable.