VESPA GTS 250 I.E. Workshop Manual page 78

Electrical system
After removing the shield back plate, remove the
electrical connection from the aerial as shown in
the photograph
Remove the protective base from the connector.
With the ignition key switch at ON check there is
battery voltage between the Red-White and Black
cables
With MIU connector disconnected check the con-
tinuity between the Orange-White cable and pin 7
of the interface wiring .
Specific tooling
020481Y Control unit interface wiring
020331Y Digital multimeter
ELE SYS - 28
Vespa GTS 250 I.E.