Checking The Lighting System - Yamaha T135SE Service Manual

EAS00788

CHECKING THE LIGHTING SYSTEM

1. The headlight and the high beam indicator
light fail to come on.
EAS00784
1. Dimmer switch
9 Check the dimmer switch for continuity.
Refer to "CHECKING THE SWITCHES".
9 Is the dimmer switch OK?
YES
2. Headlight bulb and socket
9 Check the headlight bulb and socket for con-
tinuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
9 Are the headlight bulb and socket OK?
YES
NO
The dimmer switch
is faulty. Replace
the left handlebar
switch.
NO
Replace the head-
light bulb, socket or
both.
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LIGHTING SYSTEM
3. Voltage
9 Connect the pocket tester (AC 20 V) to the
headlight and high beam indicator light con-
nectors as shown.
å When the dimmer switch is set to " % ".
∫ When the dimmer switch is set to " & ".
Headlight
Positive tester probe
Negative tester probe
High beam indicator light
Positive tester probe
Negative tester probe
9 Set the main switch to "ON".
9 Start the engine.
9 Set the dimmer switch to " % " or " & ".
9 Measure the voltage (AC 12 V) of green
(yellow 2 ) on the headlight connector (wire
harness side) and yellow
assembly connector (wire harness side).
9 Is the voltage within specification?
YES
This circuit is OK.
ELEC
→→
11 22
green or yellow
→→
33
black
→→
44
yellow
→→
55
black
1
4 on the meter
NO
Replace the rectifi-
er/regulator.