Sym GTS 250 Service Manual page 211

17. Electrical System
Left handle switch
Remove the handle cover and front cover.
Disconnect the coupler of left handle switch.
Check the continuity between two points as
indicated in the table below
High and low beam switch
Pin
LO
Position
Wire color White
Winker switch
Pin
Position
FROM R
N
PUSH OFF
FROM L
Wire color Sky blue
Brake Switch
While grasp the brake lever firmly, the terminals of
white/green and green/yellow of the brake should
have continuity.
Replace the switch if damaged.
Horn
Remove the front cover and front under spoiler.
Apply 12 V power source to two terminals of the
horn, the horn should sound.
Replace the horn if necessary.
Horn
17-20
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HL HI
Blue /
Blue
White
R WR L
Gray Orange
High and low beam switch
Horn switch
Left handle switch coupler
Brake switch
Winker switch