Yamaha YB50 Service Manual page 148

TROUBLESHOOTING
• INDICATOR LIGHT, BRAKE LIGHT, AND/OR INDICATING LIGHTS DO NOT LIGHT.
• THE HORN DOES NOT SOUND
NOTE:
• Remove the following parts before repairing the faults .
1) Front cover .
2) Inner cover
3) Rear panel (battery box)
• Use the following special tool for the repairs.
Pocket tester:
90890-03112
1. (Main) fuse
• Remove the fuses.
• Connect the pocket tester (Ωx1) on the
fuses.
• See "INSPECTION OF FUSES" in chapter
3.
2. Battery
• Check the operation of the battery.
See section "INSPECTION OF THE BAT-
TERY" in chapter 3.
Open circuit voltage:
12.8 V or more at 20 °C (68 °F)
3. Main switch
• Disconnect the main switch coupler of the
installation
• Check the switch component for continuity
between "Red
and Gray ".
CORRECT
CORRECT
and Brown " and "Red
SATISFIES
THE SPECIFIED
VALUE
SIGNALLING SYSTEM
4) Front lower fender
NO CONTINUITY
The fuse is defective, change.
INCORRECT
• Clean the battery terminals
• Charge or change the battery.
INCORRECT
The main switch is defective, change
7-18
ELEC