Megger from windings to frame / earth lug on motor case. start and run winding.
Megger from start to run winding.
Megger capacitor terminals to earth if it got one.
Check continuity of windings
Check operation of start , centrifugal switch if it has one.
Start winding has usually a higher resistance than run winding. It also switches out when the motor is up to speed.
Hope this helps. Ray.
