Modern Vespa

Hello all! Im new here, happy to meet 8)
I have a freind's VBB that have a voltage rectifier and a battery tray.
Both of us dont know if it had a battery and if the voltage regulator was connected when it last drove, We got it in parts.
I want the VBB to work without the rectifier (it has a tray but i dont think she ever got a battery - where we live the VBB didnt needed the blinkers).

What should i change in the wiring harness to get the vespa to work like a normal 6V without rectifier and a battery?
And another question - is it better to work with the rectifier when not using a battery?

Thank you.

Best I could tell you is to look up the wiring diagram on scooterhelp.com As far as the rectifier goes, you probably will not need it if you do not use a battery. The rectifiers job is to change the power from AC to DC, thus supplying power to the battery to charge.