9 - 31
–
+
ELEC
LIGHTING SYSTEM
YES
NO
2. The taillight fails to come on.
YES
NO
YES
NO
3. Voltage
• Connect the pocket tester (DC 20 V) to the
headlight couplers as shown.
È
When the light switch is set to “HI”.
É
When the light switch is set to “LO”.
Headlight coupler (wire harness side)
Headlight
Positive tester probe
→
yellow
1
or green
2
Negative tester probe
→
black
3
• Set the main switch to “ON”.
• Set the light switch to “LO” or “HI”.
• Measure the voltage (12 V) of yellow
1
or
green
2
on the headlight coupler (wire
harness side).
• Is the voltage within specification?
This circuit is OK.
The
wiring
circuit
from the main switch
to the headlight cou-
pler is faulty and
must be repaired.
1. Taillight bulb and socket
• Check the taillight bulb and socket for con-
tinuity.
Refer to “CHECKING THE BULBS AND
BULB SOCKETS”.
• Are the taillight bulb and socket OK?
Replace the taillight
bulb, socket or both.
G
Y
G
Y
B
B
DC20V
È
É
1
2
3
2. Voltage
• Connect the pocket tester (DC 20 V) to the
tail/brake light connectors as shown.
Tail/brake light connectors (wire harness
side)
Positive tester probe
→
blue
1
Negative tester probe
→
black
2
• Set the main switch to “ON”.
• Set the light switch to “LO” or “HI”.
• Measure the voltage (12 V) of blue
1
on
the tail/brake light connectors (wire har-
ness side).
• Is the voltage within specification?
This circuit is OK.
The
wiring
circuit
from the main switch
to the tail/brake light
connectors is faulty
and must be
repaired.