sychronous motor connections?

[the pict]

Can some one tell me what terminal is live and which is neutral, I have 1 x green,2 x Grey, (together) 1 x black, with the cap between green and black motor giggles about but does not turn I suspect the cap is either knacked or not correctpy connected,
Pict

 

[telectrix]

think the cap might need to go between the single black and the 2 greys, but that's a guess. as it's a guess that the green is earth. (meter on ohms from green to motor casing).

 

[Englishsparks]

Is this from a motorised valve? I

 

[the pict]

It is from a rotating jewellery display

 

[Knobhead]

The capacitor goes on the winding with the highest resistance

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