Yamaha T135SE Service Manual page 320

EAS00789
2. The meter light fails to come on.
1. Meter light bulb and socket
9Check the meter light bulb and socket for
continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
9Are the meter light bulb and socket OK?
YES
2. Voltage
9Connect the pocket tester (AC 20 V) to the
meter light coupler (wire harness side) as
shown.
Positive tester probe → → blue 1 1
Negative tester probe → → black 2 2
9Set the main switch to "ON".
9Start the engine.
9Measure the voltage (AC 12 V) of blue lead
terminal 1 on the meter light coupler (wire
harness side).
9Is the voltage within specification?
YES
This circuit is OK.
YamahaT135.COM
Yamaha T135 Service Manual
NO
Replace the meter
light bulb, socket or
both.
1
Br L L Br
Ch Dg Dg
Ch
G B B G
2
NO
Replace the rectifi-
er/regulator.
8-28
LIGHTING SYSTEM
EAS00790
3. The tail/brake light fails to come on.
1. Tail/brake light bulb and socket
9Check the tail/brake light bulb and socket for
continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
9Are the tail/brake light bulb and socket OK?
YES
2. Voltage
9Connect the pocket tester (AC 20 V) to the
tail/brake light coupler (wire harness side) as
shown.
Positive tester probe → → blue 1 1
Negative tester probe → → black 2 2
9Set the main switch to "ON".
9Start the engine.
9Measure the voltage (AC 12 V) of blue lead
terminal 1 on the tail/brake light coupler
(wire harness side).
9Is the voltage within specification?
YES
This circuit is OK.
ELEC
NO
Replace the tail/
brake light bulb,
socket or both.
1 2
B L L B
Y G/Y
Ch Dg Dg Ch
NO
Replace the rectifi-
er/regulator.