Yamaha XN125 2000 Service Manual page 233

EAS00790
3. The tail/brake light fails to come on.
1.Tail/brake light bulb and socket
• Check the tail/brake light bulb and socket for
continuity.
• Are the tail/brake light bulb and socket OK?
YES
2.Voltage
• Connect the pocket tester (DC V 20) to the
tail/brake light coupler (wire harness side) as
shown.
Positive tester probe → blue
Negative tester probe → black
Y
B
L
• Set the main switch to "ON".
• Set the light switch to "
• Measure the voltage (12 V) of blue
tail/brake light coupler (tail/brake light side).
• Is the voltage within specification?
NO
The wiring circuit from
the main switch to the
tail/brake light coupler
is faulty and must be
repaired.
NO
Replace the tail/brake
light bulb, socket or
both.
B
" or " ".
on the
YES
This circuit is OK.
LIGHTING SYSTEM
EAS00791
4. The front postion 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 SOCKET".
• Are the auxiliary light bulb and socket OK?
2. Voltage
• Connect the pocket tester (DC V 20) to the
auxiliary light coupler (wire harness side) as
shown.
Positive tester probe → blue
Negative tester probe → black
• Set the main switch to "ON".
• Set the light switch to "
• Measure the voltage (12 V) of blue
auxiliary light coupler (wire harness side).
• Is the voltage within specification?
The wiring circuit from
the main switch to the
auxiliary
conectors is faulty and
must be repaired.
8-26
ELEC
YES
Replace the auxiliary
light bulb, socket or
both.
L
B
" or " ".
NO
This circuit is OK.
light
NO
on the
YES