Yamaha YBR 125 Service Manual page 203

Exclusion of troubleshooting
Headlamp, high-beam indicator of headlamp, tailamp and instrument garden light are not lit
Remark
Before excluding ,the following components should be removed.
Side cover
Cushion
Hood
The following specific tool should be applied when excluding.
Min.multitester
Part number 90890-03112
1.Bulb and socket
Check if the bulb and socket are conducted.
2.Fuse
Remove the fuse
Connect the min·multitester
Check if the fuse is conducted.
Refer to"Inspection of fuse"section of the 3 chapter.
3.Battery
Check the battery condition.
Refer to"Inspection of battery"section of the3chapter.
Specific gravity of electrolyte
1.280,at 20 °C 68 °F
Conduction
(Ω×1) to the fuse.
Lighting system
No conduction
If the bulb or socket is failure,replace it
No conduction
If the fuse is broken,replace it
Abnormal
Supplement eletrolyte.(distilled water)
Clear the binding post of battery.
Charge or replace the battery.
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ELEC