Yamaha BT1100 2002 Service Manual page 326

2. Voltage
• Connect the pocket tester (DC 20 V) to the
tail/brake light coupler (wire harness side) as
shown.
Tester positive probe
Tester negative probe
• Set the main switch to "ON".
• Set the light switch to "3" or "6".
• Measure the voltage (12 V) of Blue/Red 1
on the tail/brake light coupler (wire harness
side).
• Is the voltage within specification?
YES
This circuit is OK.
EASB0034
4. The license plate light fails to come on.
1. License plate light bulb and socket
• Check the license plate light bulb and socket
for continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the license plate light bulb and socket
OK?
YES
Blue/Red 1
Black 2
NO
The wiring circuit
from the main switch
to the tail/brake light
coupler is faulty and
must be repaired.
NO
Replace the license
plate light bulb,
socket or both.
LIGHTING SYSTEM
2. Voltage
• Connect the pocket tester (DC 20 V) to the
license plate light coupler (wire harness side)
as shown.
Tester positive probe
Tester negative probe
• Set the main switch to "ON".
• Set the light switch to "3" or "6".
• Measure the voltage (12 V) of Blue/Red 1 on
the license plate light coupler (wire harness
side).
• Is the voltage within specification?
YES
This circuit is OK.
7-32
ELEC
Blue/Red 1
Black 2
NO
The wiring circuit
from the main switch
to the license plate
light coupler is faulty
and must be re-
paired.