Yamaha T135SE Service Manual page 320

EAS00789
2. The meter light fails to come on.
1. Meter light bulb and socket
9 Check the meter light bulb and socket for
continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
9 Are the meter light bulb and socket OK?
YES
2. Voltage
9 Connect the pocket tester (AC 20 V) to the
meter light coupler (wire harness side) as
shown.
→→
Positive tester probe
Negative tester probe
9 Set the main switch to "ON".
9 Start the engine.
9 Measure the voltage (AC 12 V) of blue lead
terminal 1 on the meter light coupler (wire
harness side).
9 Is the voltage within specification?
YES
This circuit is OK.
NO
Replace the meter
light bulb, socket or
both.
11
blue
→→
22
black
1
Br L L Br
Ch Dg Dg
Ch
G B B G
2
NO
Replace the rectifi-
er/regulator.
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LIGHTING SYSTEM
EAS00790
3. The tail/brake light fails to come on.
1. Tail/brake light bulb and socket
9 Check the tail/brake light bulb and socket for
continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
9 Are the tail/brake light bulb and socket OK?
YES
2. Voltage
9 Connect the pocket tester (AC 20 V) to the
tail/brake light coupler (wire harness side) as
shown.
Positive tester probe
Negative tester probe
9 Set the main switch to "ON".
9 Start the engine.
9 Measure the voltage (AC 12 V) of blue lead
terminal 1 on the tail/brake light coupler
(wire harness side).
9 Is the voltage within specification?
YES
This circuit is OK.
ELEC
NO
Replace the tail/
brake light bulb,
socket or both.
→→
11
blue
→→
22
black
12
B L L B
Y G/Y
Ch Dg Dg Ch
NO
Replace the rectifi-
er/regulator.