Yamaha YBR 125 Service Manual page 204

4.Main switch
Remove the branch-connector of main switch from
the bundle conductor.
Check if the switch between "the red "and "the
brown"is conducted.
5."Garden light"switch
Remove the branch-connector of handle bar sw-
itch (right) from the bundle conductor.
Connect min. Multitester(Ω×1)to the binding
post of handle bar switch (right).
Check if the switch between"the brown"and"the
blue/black"is conducted.
6.Dimmer switch of "headlamp"
Remove the branch-connector of handle bar switch
(left)from the bundle conductor.
Connect min. Multitester(Ω×1)to the binding
post of handle bar switch(right).
Check if the switch between"blue/black and yellow"
and "blue/black and green"is conducted.
Normal
Normal
Normal
Lighting system
Abnormal
If the main switch is failure,replace it
Abnormal
"Garden light"switch is failure,replace the
handlebar switch(right)
Abnormal
"Headlamp"dimmer switch is failure,replace the
handlebar switch(left)
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ELEC