Yamaha BT1100 2002 Service Manual page 331

EAS00797
2. A tail/brake light fails to come on.
1. Tail/brake light bulb and socket
• Check the tail/brake light bulb and socket for
continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the tail/brake light bulb and socket OK?
YES
2. Brake light switches
• Check the brake light switches for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the brake light switch OK?
YES
NO
Replace the tail/
brake lightbulb,
socket or both.
NO
Replace the brake
light switch.
SIGNALING SYSTEM
3. 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".
• Pull in the brake lever or push down on the
brake pedal.
• Measure the voltage (12 V) of Yellow at the
tail/brake light coupler (wire harness side).
• Is the voltage within specification?
YES
This circuit is OK.
EAS00799
3. A turn signal light, turn signal indicator light or
both fail to blink.
1. Turn signal light bulb and socket
• Check the turn signal light bulb and socket
for continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
• Are the turn signal light bulb and socket OK?
YES
7-37
ELEC
Green/Yellow 1
Black 2
B B
LR LR
GY GY
NO
The wiring circuit
from the main switch
to the tail/brake light
coupler is faulty and
must be repaired.
NO
Replace the turn sig-
nal light bulb, socket
or both.