Pump capacitor connections

At the end of last season I removed my pump and noted the wiring on a diagram. I am now refitting the pump for the new season but have lost my diagram!
The live,neutral and earth wires are simple enough to fit, but I notice that there is an unattached black wire from the capacitor that I do not know how to connect. The capacitor has just two wires, both black. The other wire is connected to the terminal block in the same place as the red wire from the pump motor. I would really appreciate some help but failing that will need to call an electrician in. Thanks for your help.
 
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