in Bar end indicators.
Some smallframe Vespas
were fitted as standard with Hella or Triom bar end indicators.
had a DC system with a battery, whilst others like the final
Japanese series had a batteryless AC system. On this
page there are fitting instructions for the indicators themselves. Here's
how it's all wired in.
Here's an original wiring
diagram for a primavera with 6vAC electrics and no battery. Click
on the thumbnail for a larger version.
This should be enough to give you the general idea - Don't worry about the
wires going to the stator plate, and look at the arrangement in the headset.
One blue wire from the left indicator, one brown wire to the switch. The
only thing to make sure of here is that the brown wire does not impede
the speedo as it reaches across the headset - it's also a good idea to
allow enough slack to account for the throttle and gear change movement.
switch itself is mounted on the gearchange, so it turns as the
gearchange and clutch
assembly turns. This allows the wires to go through the gearchange
without snagging. Long unavailable, the rubber mount is now available
new from SIP.
the difficult part is the flasher relay. Difficulty no.1 is actually
finding a 6vAc
flasher relay in the first place. Try www.50cc.nl.
Difficulty no.2 is working out where to put it. Where fitted
as standard they were located under the seat, beneath the tool
bucket. That's a bit impractical unless you have a new wiring
loom with that provision. It will have to go in the headset somewhere.
Not having a flasher unit to hand I can only guess,
but there might just be room under the speedo, or behind the
headlight. Wiring it up is actually the easy bit - one wire from
the base on the switch, and one wire to your source of power.
primavera wiring above shows a dedicated wire from the stator.
The wiring diagram for the 1974 US spec machines shows a cable
run from the horn switch (before it goes to the switch).
This has the advantage
that the whole kit can go in the headset, and you have no need
to account for the fact the handlebars turn.