Yamaha 2009 YW125Y, Service Manual

Page: 320 / 338

7-32
- +
ELEC
The wiring circuit from
the main switch to the
headlight coupler or
meter assembly cou-
pler is faulty and must
be repaired.
Refer to “CIRCUIT
DIAGRAM”.
This circuit is OK.
YES NO
LIGHTING SYSTEM
3. Voltage
8
Connect the pocket tester (DC 20 V) to the
headlight and high beam indicator light cou-
plers as shown.
A
When the dimmer switch is set to “
%
”
B
When the dimmer switch is set to “
&
”
Headlight
Positive tester probe
J J
J J J
yellow
1 1 1 1 1
Negative tester probe
J J J J J
black
2 2 2 2 2
Positive tester probe
J J
J J
J
green
3 3
3 3
3
Negative tester probe
J J J J J
black
4 4 4 4 4
Headlight coupler
High beam indicator light
Positive tester probe
J J J J J
yellow
5 5 5 5 5
Negative tester probe
J J J J J
black
6 6
6 6
6
Meter assembly coupler
8
Set the main switch to “ON”.
8
Set the engine stop switch to “
#
”.
8
Start the engine.
8
Set the dimmer switch to “
%
” or “
&
”.
8
Measure the voltage (DC 12 V) of yellow
1
or green
3
on the headlight coupler (wire
harness side) and yellow
5
on the meter
assembly coupler (wire harness side).
8
Is the voltage within specification?
B
Lg
DC20V
-
L
Br
G
6
5
Dg Y Ch
DC20V
G
B
1
3
Y
B
2
4
A
B