New motor start relay arrived, tested with the blower motor

HOOKED UP THE START RELAY AND TESTED THE BLOWER OPERATION

The new relay didn't pull in the contacts to connect the start winding - it appears it was set for a motor with a heavier draw. I went back to the original, which did pull in but the motor didn't turn when the start windings were energized.

The two sets of windings need enough of a phase difference to impart a starting torque on the motor. As the motor speeds up the current in the main winding declines enough to let the start relay disconnect the start winding. 

I grabbed all the unpolarized capacitors I had and put them in parallel to create a 1.45 uF capacitance. Putting this in series with the start winding did produce the results I wanted. The motor fired up and the start relay energized the start contacts for only a brief moment. The motor reliably started every time I tried it. 

I have ordered a ceiling fan start capacitor, 2.2 uF, which I will install in the disk drive. That should make the blower start every time.