Yamaha T135SE Service Manual page 321

4. The auxiliary 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
auxiliary light coupler (wire harness side) as
shown.
→→
Positive tester probe
→→
Negative tester probe
[L]
[R]
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 auxiliary light coupler
(wire harness side).
9 Is the voltage within specification?
YES
This circuit is OK.
NO
Replace the auxil-
iary light bulb,
socket or both.
11
blue
22
black
1
L L
Ch
Ch
B B
1
L
L
Dg
Dg
B
B
NO
Replace the rectifi-
er/regulator.
8-29
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LIGHTING SYSTEM
ELEC