Hi Jock,
This is going to be a tricky one!
I've been trying to map the wiring on Harvey's car for some time now. I used a 'Shoprider' scooter, but mine was the 'Cadiz'.
According to my scribbled notes, my wiring on the charge socket is a Thick White, which goes into the the main control box (via a 15a fuse) to a terminal marked 'B+'. There is a Thick Green wire, which goes to terminal 'B-' in the control box, and a Black Wire which goes to a multi-pin plug, again in the control box.
Unfortunately, I can't find a scribble for the plug itself, so I can't tell you which wire goes to which number. If you can wait a while (later tonight or tomorrow), I will take Harvey's to pieces and let you know the findings, if that's OK?
I'll post as soon as I have more info,
Regards,
Mark.