That's also a condition of a reversed floppy cable.
On PC equipment, the red wire normally goes closest
to the power connector. If I remember correctly, the
red wire should go farthest from the power connector.
(Just the opposite on the Ami)
Reverse it, and the floppy runs all the time. And mind
which way you plug the cable to the mother board.
Red wire to #1 shown on the left side of the floppy
connnector in that nice pic from Cyberus.
Plaz