Sym HD 125 Service Manual page 205

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17. ELECTRICAL SYSTEM
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.
Brake switch
Horn
Remove the front cover.
³ â ¥ z
Apply 12 V power source to two terminals of the
horn, the horn should sound.
Replace the horn if necessary.
17-16