First places to look are as mentioned the battery terminals and also the other end of each main lead where they are bolted onto the frame and starter solenoid.If all is well there,connect a volt meter across the battery terminals and check voltage.Now with the meter still connected,try pressing the starter switch and see if the voltage drops right away then.If it does then you've got a dud battery cell.It will show around 12 volts without load but as soon as you try to load it,the circuit goes open where there is a break or fracture inside the battery.Sounds pretty much as if this is the case as you say you've tried wiggling the wiring without any improvement so would doubt a loose connection.
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Just going for a short ride on my bike....
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