Electrical Diagrams
1974 US market wiring for Rally 200--with indicators, battery and key
This was taken from the Vespa Motorsport website and colored in.  It is not the same diagram
that Daniel has on Scooterhelp.com
Here is the current diagram for my '74
Rally-200.  This is a U.S. model, originally it had
blinkers and a battery.  Note that the stator
plate throws off so many amps that I am
running a 12V/55W halogen for the headlight
and 12V blinkers (not sure of wattage).  

When the blinkers are on, everything blinks
and the bike stutters at the highest revs.  This
can probably be rectified by using a motorcycle
flasher unit, but I have not gotten around to
doing it and the bike runs fine at normal
cruising RPMs.

Note also that the rear brake light switch is a
normal-closed switch.  If you take out the entire
blinker circuit, you will have a decent
non-battery setup.
1974 Rally No Key, No Battery, with Blinkers by Justin B.
Scooterhelp.com has four excellent diagrams.

http://www.scooterhelp.com/electrics/pages/VSE1T.rally200e.htm
Ingenuity or Bodge?-  Wiring adaptations
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Where is the diagram to this?
Dan S.  In Denver CO.
posted this on the BBS to add a
12 volt AC horn to your Rally
(note the missing flux capacitor)
FEMSATRONIC DE-CODED   by Kristian Storli
Red - Power to the CDI
Green - Trigger to the CDI From The Ignition Pickup
Blue - Link From The CDI to the Capacitor/Condenser remoted on the stator
Black - Ground to chassis at CDI
Yellow - One Side of a full wave AC stream with no ground reference
Yellow - The Other Side of a full wave AC stream with no ground reference
Green - Full wave AC out WITH ground reference
Black - Ground to junction box
Red - Kill switch lead