Yamaha YBR125ED 2005 Service Manual page 293

EAS00791
4. The auxiliary light fails to come on.
1. Auxiliary light bulb and socket
• Check the auxiliary light bulb and socket
for continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the auxiliary light bulb and socket OK?
YES
2. Voltage
• Connect the pocket tester (DC 20 V) to the
headlight coupler (wire harness side) as
shown.
Positive tester probe → blue 1
Negative tester probe → black 2
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of blue 1
on the headlight coupler (wire harness
side).
• Is the voltage within specification?
YES
This circuit is OK.
NO
Replace the auxiliary
light bulb, socket or
both.
1
2
B L L B
Y G G Y
NO
The wiring circuit
from the main switch
to the headlight cou-
pler is faulty and
must be repaired.
LIGHTING SYSTEM
7 - 31
– +
ELEC