Yamaha TW125 2003 Supplementary Service Manual page 24

Tester positive probe !
brown/white
Tester negative probe !
Tester positive probe !
brown/white
Tester negative probe !
blue/black
Tester positive probe !
Tester negative probe !
brown/white
Tester positive probe !
blue/black
Tester negative probe !
brown/white
NOTE:
When you switch the tester's positive and
negative probes, the readings in the above
chart will be reversed.
S Are the testing readings correct?
YES
5. Headlight relay
S Disconnect the headlight relay from the wire
harness.
S Connect the pocket tester (Ω
tery (12 V) to the headlight relay terminal as
shown.
S Check the headlight relay for continuity.
1
white 2
Continuity
1
3
2
white
1
No
continuity
3
1
NO
Replace the diode B.
1) and bat-
LIGHTING SYSTEM
Battery positive terminal ! brown/white
Battery negative terminal ! skyblue
Tester positive probe ! brown
Tester negative probe ! blue/black
S Does the headlight relay have continuity be-
tween brown and blue/black?
YES
6. Dimmer switch
S Check the dimmer switch for continuity.
Refer to "CHECKING THE SWITCHES" in
P13.
S Is the dimmer switch OK?
YES
7. Wiring
S Check the entire lighting system's wiring.
Refer to "CIRCUIT DIAGRAM".
S Is the lighting system's wiring properly con-
nected and without defects?
YES
Check the condition
of each of the lighting
system's circuits.
Refer to "CHECKING
THE LIGHTING
SYSTEM". (Manual
No. : 5EK1-AE1)
–16–
ELEC
1
2
NO
Replace the head-
light relay.
NO
The dimmer switch is
faulty. Replace the
left handlebar switch.
NO
Properly connect or
repair the lighting
system's wiring.