Yamaha XP500 Service Manual page 514

EAS00789
2. The meter light fails to come on.
1. Meter light bulb and socket
• Check the meter light bulb and socket for
continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the meter light bulb and socket OK?
YES
2. Voltage
• Connect the pocket tester (DC 20 V) to the
meter assembly coupler (wire harness
side) as shown.
Positive tester probe → blue 1
Negative tester probe → black/white 2
• Set the main switch to "ON".
• Measure the voltage (DC 12 V) of blue 1
on the meter assembly coupler (wire har-
ness side).
• Is the voltage within specification?
YES
This circuit is OK.
NO
Replace the meter
light bulb, socket or
both.
NO
The wiring circuit
from the main switch
to the meter assem-
bly coupler is faulty
and must be
repaired.
LIGHTING SYSTEM
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.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the tail/brake 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/red
1 on the tail/brake light assembly coupler
(wire harness side).
• Is the voltage within specification?
This circuit is OK.
8 - 36
ELEC
YES
Replace
brake 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
the tail/
bulb,
NO
circuit