VESPA GTS Super 125 i.e. Service Station Manual page 185

Vespa GTS Super 125 i.e.
Injection
Check the 7.5A Fuse No. 5
Check if there is +12 V voltage between the GREY
cable of the electric fan relay base and the ground
connection.
Check if the GREY cable between the fuse box in
the glove-box compartment and the electric fan
relay base is not interrupted.
Check if the RED cable between the electric fan
relay base and the electric fan motor is not inter-
rupted.
Check that the electric fan motor is earthed.
INJEC - 185