Yamaha XP500 Service Manual page 515

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
auxiliary light coupler (wire harness side)
as shown.
Positive tester probe → blue/red 1
Negative tester probe → black 2
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of blue/red
1 on the auxiliary light coupler (wire har-
ness side).
• Is the voltage within specification?
YES
This circuit is OK.
NO
Replace the auxiliary
light bulb, socket or
both.
NO
The wiring circuit
from the main switch
to the auxiliary light
coupler is faulty and
must be repaired.
LIGHTING SYSTEM
EAS00792
5. The license plate light fails to come on.
1. License plate light bulb and socket
• Check the license plate light bulb and
socket for continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the license plate light bulb and socket
OK?
2. Voltage
• Connect the pocket tester (DC 20 V) to the
tail/brake light assembly coupler (wire har-
ness side) as shown.
Positive tester probe → blue/red 1
Negative tester probe → black 2
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of blue 1
on the tail/brake light assembly coupler
(wire harness side).
• Is the voltage within specification?
This circuit is OK.
8 - 37
ELEC
YES
Replace the license
plate light
socket or both.
YES
The wiring
from the main switch
to the tail/brake light
assembly coupler is
faulty and must be
repaired.
– +
NO
bulb,
NO
circuit