Yamaha XV1600A1999 Service Manual page 425

EB805412
3. A tail/brake light fails to come on.
1. Tail/brake light bulb and socket
S Check the tail/brake light bulb and socket for
continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
S Are the tail/brake light bulb and socket OK?
YES
2. Voltage
S Connect the pocket tester (DC 20 V) to the
tail/brake light connectors (wire harness
side) as shown.
Tester positive probe ! blue/red
Tester negative probe ! black
S Set the main switch to "ON".
S Measure the voltage (12 V) of blue
fail/brake light coupler (wire harness side).
S Is the voltage within specification?
YES
This circuit is OK.
NO
Replace the tail/
brake light bulb,
socket or both.
1
2
on the
1
NO
The wiring circuit
from the main switch
to the tail/brake light
coupler is faulty and
must be repaired.
LIGHTING SYSTEM
4. The auxiliary light fails to come on.
1. Auxiliary light bulb and socket
S Check the auxiliary light bulb and socket for
continuity.
Refer to "CHECKING THE BULBS AND
BULB SOCKETS".
S Are the auxiliary light bulb and socket OK?
YES
2. Voltage
S Connect the pocket tester (DC 20 V) to the
auxiliary light couplers (wire harness side)
as shown.
Tester positive probe ! blue/red
Tester negative probe ! black
S Set the main switch to "ON".
S Set the light switch to "
S Measure the voltage (12 V) of blue/red
on the auxiliary light couplers (wire harness
side).
S Is the voltage within specification?
YES
This circuit is OK.
7-35
ELEC
NO
Replace the auxiliary
light bulb, socket or
both.
1
2
" or " ".
1
NO
The wiring circuit
from the main switch
to the auxiliary light
connectors is faulty
and must be re-
paired.
E