Sym Wolf SB 250 Ni Service Manual page 229

14. Electrical system
Brake light switch
While pulling the brake lever or stepping the
rear brake pedal, the terminals of black and
green/yellow of the brake should have
continuity.
Replace the switch if damaged.
Front brake switch
Rear brake switch
Horn
Disconnect the horn coupler and remove the
horn. (bolt x 1)
bolt×1
Apply 12 V power source to two terminals of
the horn, the horn should sound.
Replace the horn if necessary.
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