Yamaha PW-SE series Original Instructions Manual page 23

INSTRUMENT AND CONTROL FUNCTIONS
2 Headlight "On/Off" (Applies only to models
equipped with a headlight powered by the
battery pack. The taillight, which is powered
by the battery pack, is switched on/off with
the headlight.)
Each time you press the light switch, the headlight switch-
es between "On" and "Off".
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